2【4-x】=0.8怎么算呀 还有4x+3*0.7=6.5

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2【4-x】=0.8怎么算呀 还有4x+3*0.7=6.5
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2【4-x】=0.8怎么算呀 还有4x+3*0.7=6.5
2【4-x】=0.8怎么算呀 还有4x+3*0.7=6.5

2【4-x】=0.8怎么算呀 还有4x+3*0.7=6.5
第一题:
8-2x=0.8
8-0.8=2x
2x=8-0.8
2x=7.2
x=7.2/2
x=3.6
第二题:
4x+2.1=6.5
4x=6.5-2.1
4x=4.4
x=4.4/4
x=1.1

1、 4-x=0.8/2=0.4 x=4-0.4=3.6
2、4x=6.5-2.1=4.4 x=1.1

2(4-x)=0.8 4x+2.1=6.54
4- x =0.8/2 x=6.5-2.1
4-x =0.4 4x=4.4
x=4-0.4 ...

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2(4-x)=0.8 4x+2.1=6.54
4- x =0.8/2 x=6.5-2.1
4-x =0.4 4x=4.4
x=4-0.4 4x/4=4.4/4
x=1.1
第一题可以有两种方程,第二种很好做,希望你学习更上一层楼

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你好!
第一题:
8-2x=0.8
8-0.8=2x
2x=8-0.8
2x=7.2
x=7.2/2
x=3.6
第二题:
4x+2.1=6.5
4x=6.5-2.1
4x=4.4
x=4.4/4
x=1.1

2(4-x)=0.8 4x+2.1=6.54
4- x =0.8/2 4x=6.5-2.1
4-x =0.4 4x=4.4
x=4-0.4 x=4.4/4
x=3.6 x=1.1