Question

2.8乘以5.6加3.4乘以2加280百分怎么简便计算？

Answer 1

根据题意：2.8x（5.6+3.4）x2+280%
=2.8x10x2+2.8
=56+2.8
=58.8

Answer 2

2.8x5.6+3.4ⅹ2+280
=2.8ⅹ(5+0.6)+6.8+280
=14+1.68+6.8+280
=15.68+286.8
=302.48

Answer 3

2.6x5.6+3.4x2+280
=(2+0.6)x5.6+6.8+280
=11.2+3.36+6.8+280
=11.2+6.8+280+3.36
=18+280+3.36
=298+3.36
=301.36

Answer 4

根据题目可以这样计算。
2.8×5.6＋3.4×2＋280%
＝2.8×5.6＋3.4×2.8－3.4×0.8＋2.8
＝（5.6＋3.4＋1）×2.8－3.4×0.8
＝28－2.72
＝25.28

Answer 5

2.8*5.6+3.4*(2+280%)
=2.8*5.6+2.8*3.4+6.8
=2.8*(5.6+3.4)+6.8
=2.8*9+6.8
=32