7.5ᘧ࿾0.8锧1.2ᘧ࿾12.5怎么简算锧2.5ᘧ࿾1.6？

2024-11-30 09:56:16

推荐回答（5个）

回答1：

2.5×1.6可以变成5×0.8，所以原式＝（7.5+5）×0.8+1.2×12.5＝12.5×0.8+1.2×12.5＝12.5×（0.8+1.2）＝12.5×2＝25

回答2：

7.5×0.8+1.2×12.5+2.5×1.6
=（2.5×3）×0.8+1.2×（5×2.5）+2.5×1.6
=2.5×（3×0.8）+（1.2×5）×2.5+2.5×1.6
=2.5×2.4+6×2.5+2.5×1.6
=2.5×（2.4+6+1.6）
=2.5×10
=25

回答3：

7.5*0.8+1.2*12.5+2.5*1.6
=3*0.8*2.5+1.2*5*2.5+1.6*2.5
=2.4*2.5+6*2.5+1.6*2.5
=(2.4+6+1.6)*2.5
=10*2.5
=25

回答4：

7.5×0.8+1.2×12.5+2.5×1.6
=6+15+4
=25

回答5：

7.5*0.8+1.2*12.5+2.5*1.6
=6+1.2*25/2+5/2*1.6
=6+15+4
=25