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(1)4x+2(4xP)=20 (2)1.8÷0.3%0.2x=2 解方程,要...

1.8÷03-0.2x=2 6-0.2x=2 0.2x=6-2 x=4÷0.2 x=20

6-0.2x=2 6-2=0.2x 4=0.2x x=20

1.8÷0.3-0.2x=2 6-0.2x=2 0.2x=6-2 0.2x=4 x=20 ...

解 18÷0.3-0.2X=2 60-0.2X=2 60-2=02X 5...

x=0,y=0嘛

1.8÷0.3-0.2x=2 6-0.2x=2 0.2x=4 x=20 验算:把x=20代入...

1.8÷0.3-0.2x=2 6-0.2x=2 0.2x...

0.2X-0.4+0.5=3.7 0.2x=3.7-0.5+0.4 0.2x=3.2+0.4 0.2...

分解,可以化为完全平方式再求,我现在外面,你先自己试着做做!

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