Question

2.9×4.3+0.29×27+0.029×300的简便计算方法？

Answer 1

2.9X4.3+0.29Ⅹ27+0.029Ⅹ300

=0.029Ⅹ430+0.029×270+0.029x300

=0.029X（430+270+300）

=0.029Ⅹ1000

=29

Answer 2

2.9*4.3+0.29*27+0.029*300=2.9*4.3+2.9*2.7+2.9*3=2.9*（4.3+2.7+3）=2.9*10=29

Answer 3

算式可以写成二点9×4点三，加二点9×2点七，再加二点9×3，等于2.9乘以括号四点3+2点7+3括号，等于二点9×10，等于29

Answer 4

原式=0.029x430+0.029ⅹ270+0.029x300
=0.029ⅹ(430+270+300)
=0.029ⅹ1000
=29

Answer 5

2.9x4.3+0.29x27+0.029x300
＝2.9x4.3+2.9x0.1x27+2.9x0.01x300
＝2.9x（4.3+2.7+3）
＝2.9x10
＝29