7.2x0.2+2.4x1.2 2.22x9.9+6.66x6.7这两题的简便运算怎样算怎么算？？
答案:5 悬赏:30
解决时间 2021-01-13 15:45
- 提问者网友：我的未来我做主
- 2021-01-12 15:00
7.2x0.2+2.4x1.2 2.22x9.9+6.66x6.7这两题的简便运算怎样算怎么算？？
最佳答案
- 二级知识专家网友：英雄的欲望
- 2021-01-12 16:19
7.2*0.2+2.4*1.2
=1.2*6*0.2+2.4*1.2
=（1.2+2.4）*1.2
=3*（1.2*1.2）
=3*1.44
=4.32
2.22*9.9+6.66*6.7
=1.11*2*9.9+1.11*6*6.7
=1.11*(2*9.9+6*6.7)
=1.11*(19.8+40.2)
=1.11*60
=66.6
=1.2*6*0.2+2.4*1.2
=（1.2+2.4）*1.2
=3*（1.2*1.2）
=3*1.44
=4.32
2.22*9.9+6.66*6.7
=1.11*2*9.9+1.11*6*6.7
=1.11*(2*9.9+6*6.7)
=1.11*(19.8+40.2)
=1.11*60
=66.6
全部回答
- 1楼网友：怀裏藏嬌
- 2021-01-12 21:55
1）2.4x3x0.2+2.4x1.2 =2.4x（0.6+1.2） 。 2）2.22x9.9+2.22x3x6.7=2.22x（9.9+20.1）
- 2楼网友：青灯有味
- 2021-01-12 20:46
7.2x0.2+2.4x1.2
=2.4×3×0.2+2.4×1.2
=2.4×（0.6+1.2）
=2.4×2-2.4×0.2
=4.8-0.48=4.32
2.22x9.9+6.66x6.7
=6.66×3.3+6.66×6.7
=6.66×（3.3+6.7）
=66.6
=2.4×3×0.2+2.4×1.2
=2.4×（0.6+1.2）
=2.4×2-2.4×0.2
=4.8-0.48=4.32
2.22x9.9+6.66x6.7
=6.66×3.3+6.66×6.7
=6.66×（3.3+6.7）
=66.6
- 3楼网友：往事埋风中
- 2021-01-12 19:25
7.2x0.2+2.4x1.2
=1.2x6x0.2+2.4x1.2
=1.2x1.2+2.4x1.2
=(1.2+2.4)x1.2
=1.2x3x1.2
=1.44x3
=4.32
=1.2x6x0.2+2.4x1.2
=1.2x1.2+2.4x1.2
=(1.2+2.4)x1.2
=1.2x3x1.2
=1.44x3
=4.32
- 4楼网友：廢物販賣機
- 2021-01-12 17:48
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