应用有理数乘法法则解决以下问题(写作过程)

① (-5% 1)×13% 2 × (-5)

= 65438 in 5+0× 65438+2×5 in 03。

= 65438+2/03

②-12×(3+0的65438-4+0的65438)

=-12× 12部分1

=-1

③3 7 × (-2 3/5)-2 7 × (-2 3/5)

=(3和7-2和7-8) × (-2和3-5)

=-2又3/5

计算

①11 × (-2/9 )× (-2和1 )× (-4和1)。

= 11.5× (-9.2 )× (-5.11 )× (-2.19)

=-1

② 1.25× (-1和65438+7的0)×(-3.2)×(-8的7)。

= 5 × (-8/7 )× (-16 )× (-7/8)

=-4

③ (-6 1-20 3+5 4-12 7) × (-15× 4)

=-6 1× (-60)-20 3× (-60)+5 4× (-60)-12 7× (-60)

=10+9-48+35

=6

计算

①4×5(-65438+5/03)-(-3/5)×(-65438+5/03)-65438+5/03(-1和3/5)。

=-65438+5/03次(4/5+3-8/5)

= 13的5乘以65438+5的0

= 1.03% 1

(2) (-99和22/23) × (+69) (除法后应使用乘法分配定律)(提示:将-99和22/23除以(1-100))

=解(-99 22/23)×(+69)

=-(99 22/23)×(69)

=-(100+22/23-1)×(69)

=-(6900+22/23×69-69)

=-(6900+66-69)

=-6897