2.8乘1.4加3.6乘1.2怎样简算，要有算式！
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解决时间 2021-03-12 01:01
- 提问者网友：寂寞撕碎了回忆
- 2021-03-11 07:02
2.8乘1.4加3.6乘1.2怎样简算，要有算式！
最佳答案
- 五星知识达人网友：几近狂妄
- 2021-03-11 07:13
2.8乘1.4加3.6乘1.2怎样简算，要有算式！
2.8*1.4+3.6*1.2
解，得：
==2.8*（1.2+0.2）+3.6*1.2
==2.8*1.2+2.8*0.2+3.6*1.2
==1.2*(2.8+3.6)+2.8*0.2
==1.2*6.4+2.8*0.2
==(1+0.2)*6.4+2.8*0.2
==6.4+6.4*0.2+2.8*0.2
==6.4+0.2(6.4+2.8)
==6.4+0.2*9.2
==6.4+1.84
==8.24
*****************
方法二：
2.8*1.4+3.6*1.2
解，得：
==4*0.7*0.7*2+4*0.9*0.6*2
==4*2*（0.7*0.7+0.9*0.6）
==8*（0.49+0.54）
==8*1.03
==8.24
2.8*1.4+3.6*1.2
解，得：
==2.8*（1.2+0.2）+3.6*1.2
==2.8*1.2+2.8*0.2+3.6*1.2
==1.2*(2.8+3.6)+2.8*0.2
==1.2*6.4+2.8*0.2
==(1+0.2)*6.4+2.8*0.2
==6.4+6.4*0.2+2.8*0.2
==6.4+0.2(6.4+2.8)
==6.4+0.2*9.2
==6.4+1.84
==8.24
*****************
方法二：
2.8*1.4+3.6*1.2
解，得：
==4*0.7*0.7*2+4*0.9*0.6*2
==4*2*（0.7*0.7+0.9*0.6）
==8*（0.49+0.54）
==8*1.03
==8.24
全部回答
- 1楼网友：大漠
- 2021-03-11 08:47
（3-0.2）*（1+0.4）+（4-0.4）*（1+0.2）
- 2楼网友：渊鱼
- 2021-03-11 08:42
乘以2.8乘以1.4 3.6 1.2
=（3-0.2）* 1.4 +（4-0.4）* 1.2
= 4.2-0.28 +4.8-0.48
= 9-0.76 BR /> = 8.24
=（3-0.2）* 1.4 +（4-0.4）* 1.2
= 4.2-0.28 +4.8-0.48
= 9-0.76 BR /> = 8.24
- 3楼网友：独行浪子会拥风
- 2021-03-11 08:04
2.8×1.4+3.6×1.2
=2×1.4²+3×1.2²
=2×1.96+3×1.44
=3.92+4.32
=8.24
=2×1.4²+3×1.2²
=2×1.96+3×1.44
=3.92+4.32
=8.24
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