Question

3.5×0.6-1.8×0.5简便运算？

Answer 1

3.5×0.6-1.8×0.5
＝7×0.6×0.5-1.8×0.5
＝0.5×（4.2-1.8）
＝0.5×2.4
＝1.2

Answer 2

3.5x0.6-1.8x0.5
=3.5x0.6-0.6x3x0.5
=3.5x0.6-0.6x1.5
=0.6x(3.5-1.5)
=0.6x2
=1.2