Question

2.8×7.6+1.4×2.8+2.8的简便算法

Answer 1

2.8×7.6+1.4×2.8+2.8
=2.8×（7.6+1.4+1）
=2.8×10
=28

Answer 2

原式=2.8X（7.6+1.4+1）
=2.8X10
=28

Answer 3

2.8乘(7.6+1.4+1)

追答

等于28

嗯

Answer 4

（1x7.6＋1.4x1＋1）x2.8

Answer 5

2.8×(7.6+1.4+1)
＝2.8×10＝28