解方程 1/2x-28=50 x-2/7x=15/28 3x-1.2=3.6 x-20%x=7.2 0.9x+1.3x=5.28
解方程 1/2x-28=50 x-2/7x=15/28 3x-销缓1.2=3.6 x-20%x=7.2 0.9x+1.3x=5.28
1/2x-28=50
1/2x=50+28
1/2x=78
x=78÷1/2
x=156
x-2/7x=15/28
5/7x=15/28
x=15/28÷5/7
x=3/4
3x-1.2=3.6
3x=3.6+1.2
3x=4.8
x=4.8÷3
x=1.6
x-20%x=7.2
0.8x=7.2
x=7.2÷0.8
x=9
0.9x+1.3x=5.28
2.2x=5.28
x=5.28÷2.2
x=2.4
2/1x-28=50 4x+3/2=4/5 x-7/2x=28/15 3x-1.2=3.6 0.9x+1.3x=5.28
2/1x-28=50
2/1x=50+28=78
x=78*2
x=156
4x+3/2=4/5
4x=4/5 -3/2
4x=-7/10
x=-7/10/4
x=-7/40
x-7/2x=28/15
-5/2x=28/15
x=-28/15 *2/5
x=56/75
3x-1.2=3.6
3x=3.6+1.2
3x=4.8
x=4.8/3
x=1.6
0.9x+1.3x=5.28
2.2x=5.28
x=5.28/2.2
x=2.4
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3x+28/15=7x(解方程)
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3x+28/15=7x
解:-4X=-28/15
X=28/15×1/4
X=7/15
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x-2/3x=1/8解方程
x-2/3x=1/8
x(1-2/3)=1/8
x/3=1/8
x=3/8
解方程(1/X+7)-(1/2X2-3X+1)=X+1/2X2+13X-7
(1/X+7)-(1/2X2-3X+1)=X+1/2X2+13X-7
1/(x+7)-1/(2x-1)(x-1)=(x+1)/(2x-1)(x+7)
两边同乘:(x+7)(2x-1)(x-1)得:
(2x-1)(x-1)-(x+7)=(x+1)(x-1)
2x^2-3x+1-x-7=x^2-1
2x^2-4x-6=x^2-1
x^2-4x-5=0
(x-5)(x+1)=0
x1=5
x2=-1
解方程:(-3x-1/2)(1/2-3x)=x(9x-1/5)
(-3x-1/2)(1/2-3x)=x(9x-1/5)
(-3x-1/2)(-3x+1/2)=x(9x-1/5)
(-3x)²-(1/2)²=9x²-x/5
9x²-1/4=9x²-x/5
x/5=1/4
x=5/4
解方程:x5/3=2x-28
x5/3=2x-28
5x=6x-84
5x-6x=-84
x=84
解方程:①x+7/9x=4/3 ②6×4-1/2x=12 ③1/3x-1/6=2
①x+7/9x=4/3
16/9x=4/3
4/3x=1
x=3/4
②6×4-1/2x=12
24-12=1/2x
1/2x=12
x=24
③1/3x-1/6=2
2x-1=12
2x=13
x=13/2
解方程 (3/4x+1)×8=7x+1 (亏扰模1/2x+1/3)×2=3x-1/2
(3/4x+1)×8=7x+1
3/4x×8+1×8=7x+1
6x+8=7x+1
7x-6x=8-1
x=7
(1/2x+1/3)×2=3x-1/2
x+2/3=3x-1/2
3x-x=2/3+1/2
2x=7/6
x=7/6÷2
x=7/12