Question

8×7.6+1.4×2.8+2.8简便运算的方法？

Answer 1

＝8*7.6+1.4*2.8+2.8
＝8*7.6+1.4*2.8+2*1.4
＝8*7.6+1.4*（2.8+1）
＝8*2*3.8+1.4*3.8
＝3.8*（8*2+1.4）
＝3.8*17.4
＝66.12

Answer 2

2.8×7.6+1.4×2.8+2.8简便运算法如下：
2.8×7.6+1.4×2.8+2.8
=2.8×（7.6+1.4+1）
=2.8×10
=28

Answer 3

原式＝8×7.6+2.8×2.4＝5.2×7.6+（7.6+2.4）×2.8＝5.2×7.6+10×2.8＝39.52+28＝67.52

Answer 4

=2.8*7.6+（1.4+1）*2.8
=2.8*7.6+2.4*2.8
=2.8*（7.6+2.4）.
=2.8*10
=28

Answer 5

8×7.6+1.4×2.8+2.8
=8x7.6+2.8x（1.4+1）
=8x7.6+2.8x2.5
=60.8+7
=67.8