Question

8.05÷3.5×1.5简便计算？

Answer 1

8.05÷3.5x1.5
=8.05*1.5÷3.5
=(8+0.05)*(1+0.5)÷3.5
=(8*1+8*0.5+0.05*1+0.05*0.5)÷3.5
=(12+0.075)÷(3+0.5)
=12÷3+12÷0.5+0.075÷3+0.075÷0.5
=4+24+0.025+0.15
=28.175

Answer 2

因为
8又1/20=161/20
3又1/2=7/2即得到70/20
1又1/2=3/2即得到30/20
所以
161/20÷70/20×30/20=161/20×20/70×30/20
=161/20×30/70
=161/20×3/7
=483/140
=3.45