Question

2.15×1.2+68.5×0.12+1.2,用简便运算,怎么算？

Answer 1

2.15×1.2+68.5×0.12+1.2

=2.15×1.2+6.85×1.2+1.2

【提取1.2】

=1.2x(2.15+6.85+1)

=1.2x(9+1)

=1.2x10

=12

Answer 2

统一化成1.2*一个数的形式：
1.2x
2.15 + 1.2x6.85 + 1.2x1
合并得：
1.2x（2.15+6.85+1）
等于：
1.2x10 =12

如有帮助给个采纳叭～

Answer 3

原式＝2.15×1.2+（6.85×10）×0.12+1.2
＝2.15×1.2+6.85×（10×0.12）+1.2
＝2.15×1.2+6.85×1.2+1.2×1
＝（2.15+6.85+1）×1.2
＝10×1.2
＝12

追答

原式＝2.15×1.2+（6.85×10）×0.12+1.2
＝2.15×1.2+6.85×（10×0.12）+1.2
＝2.15×1.2+6.85×1.2+1.2×1
＝（2.15+6.85+1）×1.2
＝10×1.2
＝12

Answer 4

2.15×1.2+68.5×0.12+1.2
=2.15×1.2+6.85×10×0.12+1.2
=2.15×1.2+6.85×1.2+1.2
=1.2×（2.15+6.85+1）
=1.2×10
=12

Answer 5

2.15×1.2+68.5×0.12+1.2,用简便运算,怎么算？
2.15×1.2+68.5×0.12+1.2

=1.2x(2.15+6.85+1)
=1.2x10
=12