小数的混合运算加简算
问题描述：
小数的混合运算加简算
答
1.2×6.8＋1.2×3.2
=1.2×﹙6.8+3.2﹚
=1.2×10
=12
125×5×0.8
=125×0.8×5
=100×5
=500只要题目 ，亲
......1.8×2.4-0.8×2.4=﹙1.8-0.8﹚×2.4
.......3.2×12.5×8=3.2×﹙12.5×8﹚
.......0.3×12+0.7×12=﹙0.3+0.7﹚×12
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.......15×3.2+15×6.8=15×﹙3.2+6.8﹚