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怎样解方程0.5x加0.1乘(30减x)等于7

解答如下:根据描述列式如下0.5X+0.1(30-X)=7解:0.5X+3-0.1X=70.6X=7-30.6X=4X=4÷0.6X=40/6X=20/3即解为20/3

0.5*0.1*(30-x)=70.05*(30-x)=730-x=7/0.0530-x=140-x=110x=-110

第一步换位:X=30*0.5-7第二步得解:X=-2.5

先移项,15.5x-0.5x=30,可得15x=30,解得x=2

X-0.5X=300.5x=30x=60

x-0.5x=7即0.5x=7,得x=14

x-0.5x=7(1-0.5)x=70.5x=7x=14

0.5x+(50-x)*0.1=7解:0.5x+5-0.1x=70.4x+5=70.4x=7-50.4x=2x=2÷0.4x=5

1+0.5x=3.5 0.5x=3.5-1 0.5x=2.5 x=2.5/0.5 x=5

解: 0.5x+7*0.5=70.5x+3.5=70.5x=3.5x=7

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