1.2x2.5+0.8x2.8简便方法计算

2025-05-14 23:37:12

推荐回答（4个）

回答1：

1.2x2.5+0.8x2.8
=3×0.4×2.5+(1—0.2)×2.8
=3+2.8—0.2×2.8
=5.8—0.56
=5.24

回答2：

=1.2*2.5+0.8*2.5+0.8*0.3=（1.2+0.8）*2.5+0.24=5+0.24=5.24

回答3：

1.2x2.5+0.8x2.8
=1.2x2.5+0.8x2.5+0.8x0.3
=(1.2+0.8)x2.5+0.8x0.3
=2x2.5+0.8x0.3
=5+0.24
=5.24

回答4：

1.2x2.5+0.8x2.8
=1.2x2.5+0.8x(2.5+0.3）
=1.2x2.5+0.8x2.5+0.8x0.3
=（1.2+0.8）x2.5+0.24
=2x2.5+0.24
=5+0.24
=5.24