七年级一元一次方程题20%+(1-20%)(320-x)=320×40% 2(x-2)+2=x+1 2(x-2)-3(4x-1)=9(1-x) x/3 -5 = (5-x)/2 2(x+1) /3=5(x+1) /6 -1 (1/5)x +1 =(2x+1)/4 (5-2)/2 - (4+x)/3 =1 x/3 -1 = (1-x)/2 (x-2)/2 - (3x-2)/4 =-1 11x+64-2x=100-9x 15-(8-5x)=7x+(4-3x)

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七年级一元一次方程题20%+(1-20%)(320-x)=320×40% 2(x-2)+2=x+1 2(x-2)-3(4x-1)=9(1-x) x/3 -5 = (5-x)/2 2(x+1) /3=5(x+1) /6 -1 (1/5)x +1 =(2x+1)/4 (5-2)/2 - (4+x)/3 =1 x/3 -1 = (1-x)/2 (x-2)/2 - (3x-2)/4 =-1 11x+64-2x=100-9x 15-(8-5x)=7x+(4-3x)

七年级一元一次方程题20%+(1-20%)(320-x)=320×40% 2(x-2)+2=x+1 2(x-2)-3(4x-1)=9(1-x) x/3 -5 = (5-x)/2 2(x+1) /3=5(x+1) /6 -1 (1/5)x +1 =(2x+1)/4 (5-2)/2 - (4+x)/3 =1 x/3 -1 = (1-x)/2 (x-2)/2 - (3x-2)/4 =-1 11x+64-2x=100-9x 15-(8-5x)=7x+(4-3x)
七年级一元一次方程题
20%+(1-20%)(320-x)=320×40%
2(x-2)+2=x+1
2(x-2)-3(4x-1)=9(1-x)
x/3 -5 = (5-x)/2
2(x+1) /3=5(x+1) /6 -1
(1/5)x +1 =(2x+1)/4
(5-2)/2 - (4+x)/3 =1
x/3 -1 = (1-x)/2
(x-2)/2 - (3x-2)/4 =-1
11x+64-2x=100-9x
15-(8-5x)=7x+(4-3x)

七年级一元一次方程题20%+(1-20%)(320-x)=320×40% 2(x-2)+2=x+1 2(x-2)-3(4x-1)=9(1-x) x/3 -5 = (5-x)/2 2(x+1) /3=5(x+1) /6 -1 (1/5)x +1 =(2x+1)/4 (5-2)/2 - (4+x)/3 =1 x/3 -1 = (1-x)/2 (x-2)/2 - (3x-2)/4 =-1 11x+64-2x=100-9x 15-(8-5x)=7x+(4-3x)
20%+(1-20%)(320-x)=320×40%
0.2+0.8*(320-x)=128
0.8*(320-x)=127.8
320-x=159.75
x=160.25
2(x-2)+2=x+1
2x-4+2=x+1
2x-2=x+1
x=3
2(x-2)-3(4x-1)=9(1-x)
2x-4-12x+3=9-9x
-10x-1=9-9x
-x=10
x=-10
x/3 -5 = (5-x)/2
两边同时乘6,得 2x-30=3(5-x)
2x-30=15-3x
5x=45
x=9
2(x+1) /3=5(x+1) /6 -1
两边同时乘6,得4(x+1)=5(x+1)-6
-x-1=-6
-x=-5
x=5
(1/5)x +1 =(2x+1)/4
两边同时乘20,得4x+20=5(2x+1)
4x+20=10x+5
-6x=-15
x=2.5
(5-2)/2 - (4+x)/3 =1
1.5-(4+x)/3=1
两边同时乘3,得
4.5-(4+x)=3
0.5-x=3
-x=2.5
x=-2.5
x/3 -1 = (1-x)/2
两边同时乘6,得 2x-6=3(1-x)
2x-6=3-3x
5x=9
x=1.8
(x-2)/2 - (3x-2)/4 =-1
两边同时乘4,得
2(x-2)-(3x-2)=-4
2x-4-3x+2=-4
-x-2=-4
-x=-2
x=2
11x+64-2x=100-9x
9x+64=100-9x
18x=36
x=2
15-(8-5x)=7x+(4-3x)
15-8+5x=7x+4-3x
7+5x=4x+4
x=-3

20%+(1-20%)(320-x)=320×40%
0.2+0.8*(320-x)=128
0.8*(320-x)=127.8
320-x=159.75
x=160.25
2(x-2)+2=x+1
2x...

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20%+(1-20%)(320-x)=320×40%
0.2+0.8*(320-x)=128
0.8*(320-x)=127.8
320-x=159.75
x=160.25
2(x-2)+2=x+1
2x-4+2=x+1
2x-2=x+1
x=3
2(x-2)-3(4x-1)=9(1-x)
2x-4-12x+3=9-9x
-10x-1=9-9x
-x=10
x=-10
x/3 -5 = (5-x)/2
两边同时乘6,得 2x-30=3(5-x)
2x-30=15-3x
5x=45
x=9
2(x+1) /3=5(x+1) /6 -1
两边同时乘6,得4(x+1)=5(x+1)-6
-x-1=-6
-x=-5
x=5
(1/5)x +1 =(2x+1)/4
两边同时乘20,得4x+20=5(2x+1)
4x+20=10x+5
-6x=-15
x=2.5
(5-2)/2 - (4+x)/3 =1
1.5-(4+x)/3=1
两边同时乘3,得
4.5-(4+x)=3
0.5-x=3
-x=2.5
x=-2.5
x/3 -1 = (1-x)/2
两边同时乘6,得 2x-6=3(1-x)
2x-6=3-3x
5x=9
x=1.8
(x-2)/2 - (3x-2)/4 =-1
两边同时乘4,得
2(x-2)-(3x-2)=-4
2x-4-3x+2=-4
-x-2=-4
-x=-2
x=2
11x+64-2x=100-9x
9x+64=100-9x
18x=36
x=2
15-(8-5x)=7x+(4-3x)
15-8+5x=7x+4-3x
7+5x=4x+4
x=-3
哥 这也忒简单了吧
还有 别忘写 解

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