Question

7.3×3.1+31×0.25简便计算求大神解答🙏🙏🙏🙏🙏？

Answer 1

7.3×3.1+31×0.25
＝7.3×3.1+3.1×2.5
＝(7.3+2.5)×3.1
＝9.8×3.1
＝10×3.1-0.2×3.1
＝31-0.62
＝30.38

Answer 2

因为7.5×3.1=0.75×31，所以原式等于0.75×31+0.25×31运用乘法分配律逆运算就是31×（0.75+0.25）=31

Answer 3

解：原式=7.3x3.1+3.1x10x0.25
=7.3x3.1+3.1x2.5
=3.1x(7.3+2.5)
=3.1x9.8
=30.38
答：答案是30.38。

Answer 4

7.3×3.1＋31×0.25
＝7.3×3.1＋3.1×2.5
＝3.1×(7.3＋2.5)
＝3.1×(10－0.2)
＝3.1×10－3.1×0.2
＝31－0.62
＝30.38

Answer 5

7.3×3.l＋31×0.25
＝（7.3＋2.5）×3.l
＝9.8×3.1
＝9.8×3＋0.98
＝29.4＋0.98
＝30.38