五年级下册简单数学计算题及答案
先口算以下问题。(23分)
10-2.65= 0.9×0.08= 528-349= 6+14.4= 24÷0.04=
12.34-2.3= 0÷3.8= 0.77+0.33= 7÷1.4= 67.5+0.25=7.2÷8×4= 5-1.4-1.6= 400÷125÷8= 1.9×4×0.5=
80×0.125= 3× = 6 6= 2 -( + )= 10 2=
3.2×7÷3.2×7= ( - )×12= 187.7×11-187.7= 1- 62.5%=
二、写出下列各题简单运算中用到的定律或性质(12分)
4 +3.2+5 +6.8 25×(8×0.4)×1.25 7 -(2 - )
( ) ( ) ( )
( + + )×72 93.5÷3 16÷2.5
( ) ( ) ( )
第三,用简单的方法计算。(65分)
1125-997 998+1246+9989 (8700+870+87)÷87
125×8.8 1.3+4.25+3.7+3.75 17.15-(3.5-2.85)
3.4×99+3.4 4.8×1.01 0.4×(2.5÷73)
(1.6+1.6+1.6+1.6)×25 ( + - )÷
12.3-2.45-5.7-4.55 2 + 0.125×0.25×64
64.2×87+0.642×1300 78×36+7.8×741-7 17+ 8
0.125× +0.5 2.42 +4.58 -43
25÷100 4.25-3 -(2 -1 )
(1)1.25*17.6+36.1/0.8+2.36*12.5
1.25*17.6+36.1/0.8+2.36*12.5
=(5/4)*17.6+36.1*(5/4)+23.6*(50/4)
=176/8+361/8+236/8
=773/8=96.625
(2)7.5*2.3+1.9*2.5
7.5*2.3+1.9*2.5
=7.5*(1.9+0.4)+1.9*2.5
=(7.5+2.5)*1.9+7.5*0.4
=19+3 =22
(3)2004/2003*2005
2004/2003*2005
=(2004/2003)*(2003+2)
=2004+4008/2003
(4)276*543-267/276+543*275
276*543-267/276+543*275
=543*(276+275)-267/276
=543*551-267/276
1)五十二和二十五十一× 79.45+159× 47.56+79和二十五十一× 52.44
=52.44×79.45+159×47.56+79.55×52.44
=52.44×(79.45+79.55)+159×47.56
=52.44×159+159×47.56
=159×(52.44+47.56)
=159×100
=15900
3)2002+2001-2000-1999+1998+1997-1996-1995+……+2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+……+(6-4)+(5-3)+2+1
= 2+2+2+2+...+2+2(从3-2002***2000,有1000个二)+2+1。
=1000×2+2+1
=2003
第4题和第5题都用了一个换算公式1/(a×b)= 1/(b-a)×(1/a-1/b)。
如1/15 = 1/(3×5)= 1/(5-3)×(1/3-1/5)= 1/2×
4)(1×2) +(2×3) +(3×4)+...+(10× 11)
=1/(1×2)+1/(2×3)+1/(3×4)+……+1/(10×11)
=(1-1/2)+(1/2 - 1/3)+(1/3 - 1/4)+……+(1/10 - 1/11)
=1-1/11
=10/11
5)三分之一+十五分之一+三十五分之一+六十三分之一+九十九分之一。
=1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+1/(9×11)
=1/2×(1-1/3)+1/2×(1/3-1/5)+1/2×(1/5-1/7)+1/2×(1/7-1/9)+1/2×(1/9-1/11)
=1/2×(1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11)
=1/2×(1-1/11)
=1/2×10/11
=5/11
6)六分之一又六分之五+七十二分之九二十+十一三十-十三四十二+十五五十六
(根据提示,1和1/2=1+1/2,+1/2+1/3 = 5/6...)
=(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+ 1/2 - 1/2 - 1/3 + 1/3 + 1/4 - 1/4 - 1/5 + 1/5 + 1/6 - 1/6 - 1/7 + 1/7 + 1/8
=1+1/8
=9/8
仔细看看,不会很难,一切都可以简单计算。你自己看看吧。一些局部分量将更容易计算。我不在五年级。不知道你跟我们学的一样吗,只能找一些。对不起,请原谅我。
五年级数学第二册简单计算题120 1。5/2 -( 3/2+4/5)
2.7/8 + ( 1/8 + 1/9 )
3.5/6 + ( 1/2 + 2/3 )
4.9/7 - ( 2/7 - 10/21 )
5.3/7 + 49/9 + 4/7
6.8/9 + 15/36 + 3/27
7.5/2 - ( 3/2 + 4/5 )
8.7/8 + ( 1/8 + 1/9 )
9.9/7 - ( 2/7 - 10/21 )
10.1/5 + ( 3/7 + 8/10 )
操作简单:
1) 500+(407+0)
2) 386+382+114
3) 42+(91+158+109)
4) (87+103+113)+97
5) (246+387+154)+13
6) 49+(71+151+129)
7) 255+(79+45)
8) (169+39+131)+261
9) 219+175+181+225
10) 14+498+486
11)84×101
12)(300+6)×12
13)504×25
14)25×(4+8)
15)78×102
16)125×(35+8)
17)25×204
18)(13+24)×8
19)99×64
20)99×13+13
五年级下册简单数学题100一定有答案。五年级下册简单数学题的答案在哪里找?首先,口头计算以下问题
10-2.65= 0.9×0.08= 528-349= 6+14.4= 24÷0.04=
12.34-2.3= 0÷3.8= 0.77+0.33= 7÷1.4= 67.5+0.25=7.2÷8×4= 5-1.4-1.6=
00÷125÷8= 1.9×4×0.5=
80×0.125= 3× = 6 6= 2 -( + )= 10 2=
3.2×7÷3.2×7= ( - )×12= 187.7×11-187.7= 1- 62.5%=
第二,写下下列每个问题的简单运算中使用的定律或性质
4 +3.2+5 +6.8 25×(8×0.4)×1.25 7 -(2 - )
( ) ( ) ( )
( + + )×72 93.5÷3 16÷2.5
( ) ( ) ( )
720÷16÷5 630÷42 456-(256-36)
102×35 98×42 158+262+138 375+219+381+225
5001-247-1021-232 (181+2564)+2719 378+44+114+242+222
276+228+353+219 (375+1034)+(966+125) (2130+783+270)+1017
99+999+9999+99999 7755-(2187+755) 2214+638+286
3065-738-1065 899+344 2357-183-317-357
2365-1086-214 497-299 2370+1995
简单数学问题及答案五年级(1)2.5*32*0.125
=(2.5*4)*(8*0.125)
=10*1
=10
(2)3.5-7+6.5
=3.5+6.5-7
=3
(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25
(4)8.9×1.25-0.9×1.25
=1.25(8.9-0.9)
=10
(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74
(6)6.5×9.5+6.5×0.5
=6.5×(9.5+0.5)
=6.5×10
=65
(7)0.35×1.6+0.35×3.4
=0.35*(1.6+3.4)
=0.35*5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)*12.5
=8*12.5
=100
(11)23.65-(3.07+3.65)
=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×0.25)8×7×1.25
=(4+1)*7*10
=5*7*10
=350
(13)1.65×99+1.65
=1.65*(99+1)
=1.65*100
=165
(14)27.85-(7.85+3.4)
=27.85-7.85+3.4
=20+3.4
=23.4
(15)48×1.25+50×1.25×0.2×8
7.8×9.9+0.78
=7.8*(9.9+0.1)
=7.8*10
=78
(16)4.8×46+4.8×54
=(46+54)*4.8
=100*4.8
=480
(17)673-327-173
=673-(327+173)
=673-500
=173
(18)4.44*2.5
=1.11*(4*2.5)
=1.11*10
=11.1
(19)3.5÷1.4
=(3.5÷0.7)÷(1.4÷0.7)
=5÷2
=2.5
(20)1+2+3+4+5......+99+100
=(1+99)+(2+98)+(3+97)+......+(49+51)+50
=(100÷2-1)*100+50
=4900+50
=4950
这样可以吗?
五年级数学第二册简单计算题举例1,5.76+13.67+4.24+6.33 =(5.76+4.24)+(13.67+6.33)= 10+65438。37.24+23.79-17.24 = 37.24-17.24+23.79 = 20+23.79 = 43.79例3,4× 3.78× 0.25 = 4× 0.25× 3.78 = 6548。125×246×0.8 = 125×0.8×246 = 100×246 = 24600例5,(2.5+12.5 )× 40 = 2.5× 40+6544。3.68×4.79+6.32×4.79 =(3.68+6.32)×4.79 = 10×4.79 = 47.9例7.26 . 86×25.66-16.86×25.66 =(26 5.7×99+5.7 = 5.7×(99+1)= 5.7×654457×101 = 57×(100+1)= 57×100+57×1 = 5757例11,7。= 7.8×1+7.8×0.1 = 7.8+0.78 = 8.58例12,25×32 =25×4×8 =100×8 =800例13。125×0.72 = 125×8×0.09 = 1000×0.09 = 90例14,87× 2/85 = (85+2 )× 2/85 = 85× 2。56.5-3.7-6.3 = 56.5-(3.7+6.3)= 56.5-10 = 46.5例16,32.6÷0.4÷2.5 = 32.6÷(0.4×86.7×0.356+1.33×3.56 = 8.67×3.56+656
五年级数学第二册离型计算问题及答案离型计算是递归方程计算,是把计算过程完整写出的运算,也就是离开横式的计算。计算混合运算时,通常是一步算出一个表达式(一步一步算,原公式上不能写等号),每一步的过程都要写出来。一般来说,等号要往前走,不要和第一行对齐。也就是离开原来的计算。要掌握的主要是记得先算乘除,再做加减。在乘除法的逐次计算中,应按照从左到右的顺序计算。遇到圆括号,首先要计算圆括号的内侧。在分离过程中,要根据操作顺序画出操作顺序线,还要做好“三查”。首先要检查从书上抄到练习本上的数字和符号是否正确。第二,要检查从横到竖复制的数字和符号是否复制正确。第三,要检查草稿纵向是否抄对,横向是否抄对,小数点位置是否正确,有无遗漏。