Question

4.2×0.35+0.42×7.5+0.042×1的简便计算？

Answer 1

=0.42x（3.5+7.5）+0.042

=0.42x（10+1）+0.042

=4.2+0.42+0.042

=4.662

Answer 2

因为0.42×7.5=4.2×0.75，0.042×1=4.2×0.01，所以原式等于4.2×0.35+4.2×0.75+4.2×0.01运用乘法分配律逆运算就是4.2×（0.35+0.75+0.01）=4.662

Answer 3

提取公因式
公因数是4.2
=4.2x0.35+4.2x0.75+4.2x0.01
=4.2x（0.35+0.75+0.01）
=4.2x1.11
=4.2+0.42+0.042
=4.662

Answer 4

4.2×0.35+0.42×7.5+0.042×1
=4.2×0.35+4.2×0.75+4.2×0.01
=4.2×（0.35+0.75+0.01）
=4.2×1.11
=4.2×1+4.2×0.1+4.2×0.01
=4.2+0.42+0.042
=4.662

Answer 5

=0.042×(35+75+1)
=0.042×(100+10+1)
=4.2+0.42+0.042
=4.662