0.85乘0.4乘2.5和102乘5.2的简便计算
问题描述:
0.85乘0.4乘2.5和102乘5.2的简便计算
答
0.85×0.4×2.5=0.85×(0.4×2.5)
=0.85×1
=0.85
102×5.2=(100+2)×5.2
=100×5.2+2×5.2
=520+10.4
=530.4
答
0.85乘0.4乘2.5
=0.85*(0.4*2.5)
=0.85*1
=0.85
102乘5.2
=(100+2)*5.2
=100*5.2+2*5.2
=520+10.4
=530.4