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简便运算:8.7*9.9简便运算:4.25*5.24+1.52*2.51简便运算:(4.8*7.5*8.1)除以(2.4*2.5*2.7)

题目详情
简便运算:8.7*9.9 简便运算:4.25*5.24+1.52*2.51 简便运算:(4
.8*7.5*8.1)除以(2.4*2.5*2.7)
▼优质解答
答案和解析
8.7*9.9=8.7*(10-0.1)=87-0.87=86.13
4.25*5.24+1.52*2.51=(4+0.25)×(5+0.24)+(1+0.52)×(2+0.51)
=20+0.96+1.25+0.06+(2+0.51+1.04+0.2652)
=22+3.82+0.2652
=26.0852
(4.8*7.5*8.1)/(2.4*2.5*2.7)=(4.8/2.4)*(7.5/2.5)*(8.1/2.7)=2*3*3=18