0.8*32+3.2*2 简便计算
问题描述:
0.8*32+3.2*2 简便计算
99*12+1.2*10
87.4*36-3.6*74
答
0.8*32+3.2*2
=0.8*32+32*0.2
=32*(0.8+0.2)
=32*1
=32
99*12+1.2*10
=99*12+12*1
=12*(99+1)
=12*100
=1200
87.4*36-3.6*74
=87.4*36-36*7.4
=36*(87.4-7.4)
=36*80
=2880