Question

3.6×2.5+1.5×4.2该怎么简便计算？

Answer 1

3.6×2.5+1.5×4.2该这样简便计算：
3.6×2.5+1.5×4.2
=9×0.4×2.5+1.5×2×2.1
=9×（0.4×2.5）+（1.5×2）×2.1
=9×1+3×2.1
=9+6.3
=15.3

Answer 2

3.6X2.5+1.5Ⅹ4.2的简便计算：
0.6x6X0.5x5+3X0.5x6Ⅹ0.7
=(0.6x5)Ⅹ(6x0.5)十(3x0.7)Ⅹ(0.5X6)
=3x3十2.1x3
=9+6.3
=15.3
希望能够帮到你。

Answer 3

3.6×2.5+1.5×4.2简便计算是（3.6÷2）×（2.5×2）+（1.5×2）×（4.2÷2）=1.8×5+3×2.1=9+6.3=15.3

Answer 4

解：3.6×2.5+1.5×4.2
＝(0.9×4)×2.5+1.5×(0.6×7)
＝0.9×(4×2.5)+(1.5×0.6)×7
＝0.9×10+0.9×7
＝9+6.3
＝15.3
这道题的简便运算主要运用了乘法的交换律和结合律。

Answer 5

3.6×2.5+1.5×4.2
=3.6×1.5+3.6×1+1.5×4.2
=1.5×（3.6+4.2）+3.6
=1.5×7.8+3.6
=1.5×（8-0.2）+3.6
=1.5×8-1.5×0.2+3.6
=12-0.3+3.6
=15.3