找到简单问题的答案。7.5× 45+17× 2.541.2× 8.1+1× 9.25+537....

1.17*(7.5+2.5)+28*7.5=170+7*4*7.5=170+7*30=3802.412*0.81+(412+125)*0.19+11* 9.25=412*(0.81+0.19)+1.25*(11+8)+11*9.25=412+

1.25*8+11*(1.25+9.25)=412+10+11*11=5433.(1+0.23+0.34)×(0.23×0.34

)+(1+0.23+0.34)*0.65

-(1+0.23+0.34)*(0.23×0.34

)-0.65×

(0.23+0.34)=0.65* (1+0.23+0.34-0.23-0.34)=0.654.3.57+(7.76-4.33)=3.57+3.43=75.6.93-1.83+3.9=5+3.9=8.96.121+53-(68+85)=174-153=265438+ 07.31 * (4 * 25) = 31 * 100 = 31008.我不知道符号在哪里。我最好加一些括号9。(1+1/2+65438+.4)+(1+1/2+1/3+1/4)×1/5-1*(2/1+1/3+4/1)-(1/2+1/3+1/4+1/5)

×

(1/2+1/3+1/4)= 1/5 *(1+1/3+1/4-1/2-1/3-1/4)= 1/565438给分。