非常急..

题目

非常急..
【1、填空】8.8×7.5=8×【 】×【 】×2.5=﹙【 】×【 】﹚×﹙8×2.5﹚
7.9×2.1＋7.9×7.9=【 】×﹙【 】＋【 】﹚
2.5×﹙2.83×0.4﹚=﹙【 】×【 】﹚×【 】
【2、脱式计算,能简便的就简便】 25×6.7－25×2.7 3.7×2.3＋2.3×6.3 99×3.5＋3.5
= = =
= = =

答案

8.8×7.5=8×【1.1 】×【 3 】×2.5=﹙【 1.1 】×【3 】﹚×﹙8×2.5﹚7.9×2.1＋7.9×7.9=【 7.9 】×﹙【2.1 】＋【 7.9 】﹚2.5×﹙2.83×0.4﹚=﹙【 2.5 】×【 0.4 】﹚×【 2.83 】25×6.7－25×2.7 ＝25×...