括号0.8乘以,0.21加0.8乘以0.19括号乘 - 知识问答

括号0.8乘以,0.21加0.8乘以0.19括号乘以1.25乘以2.5

1个回答

（0.8×0.21+0.8×0.19）×1.25×2.5
=0.8×（0.21+0.19）×1.25×2.5
=0.8×0.4×1.25×2.5
=（0.8×1.25）×（0.4×2.5）
=1×1
=1

相关问题