总述:本次共解1题。其中
☆算术计算1题
〖1/1算式〗
作业:求算式 (1*2+2*3)*(1/1*2+1/2*3)+(2*3+3*4)*(1/2*3+1/3*4)+0.|+(19*20+20*21)*(1/19*20+1/20*21) 的值.
题型:数学计算
解:
(1*2+2*3)*(1/1*2+1/2*3)+(2*3+3*4)*(1/2*3+1/3*4)+0.|+(19*20+20*21)*(1/19*20+1/20*21)
=8*(1/1*2+1/2*3)+(2*3+3*4)*(1/2*3+1/3*4)+0.+(19*20+20*21)*(1/19*20+1/20*21)
=8*3.5+(2*3+3*4)*(1/2*3+1/3*4)+0.+(19*20+20*21)*(1/19*20+1/20*21)
=8*3.5+18*(1/2*3+1/3*4)+0.+(19*20+20*21)*(1/19*20+1/20*21)
=8*3.5+18*2.833332+0.+(19*20+20*21)*(1/19*20+1/20*21)
=8*3.5+18*2.833332+0.+800*(1/19*20+1/20*21)
=8*3.5+18*2.833332+0.+800*2.10264
=28+18*2.833332+0+800*2.10264
=28+50.999976+0+800*2.10264
=28+50.999976+0+1682.112
=78.999976+0+1682.112
=78.999976+1682.112
=1761.111976 答案:(1*2+2*3)*(1/1*2+1/2*3)+(2*3+3*4)*(1/2*3+1/3*4)+0.|+(19*20+20*21)*(1/19*20+1/20*21)=1761.111976你的问题在这里没有得到解决?请到 热门难题 里面看看吧!