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解方程:3(4x-1)=7(2x-1)+1 ②4x-3(20-x)=...

(1)15-(7-5x)=2x+(5-3x)去括号得:15-7+5x=2x+5-3x,移项合并得:6x=-3,解得:x=- 1 2 ;(2)去分母得:3(x-1)-12=2(2x+1),去括号得:3x-3-12=4x+2,解得:x=-17;(3)去括号得:4x-60+3x=5x-140+7x,解得:x=40.

(1)2x-3=x+1;移项得:x=4;(2) 4x-3(20-x)=6x-7(9-x)去括号得:4x-60+3x=6x-63+7x,∴6x=3,∴x=12;(3)y5-y?12=1-y+25,去分母得2y-5(y-1)=10-2(y+2)∴2y-5y+5=10-2y-4,∴y=-1;(4)x?30.5?x+40.2=1.6,方程变形为:x?312?x+415...

x=4; x=60; x=16; x=6.

2(x+1)-3(x-2)=4+x 2x+2-3x+6=4+x -x+8=4+x x+x=8-4 2x=4 x=2 5(x+2)=2(2x+7) 5x+10=4x+14 5x-4x=14-10 x=4 x-2[x-3(x-1)]=8 x-2(x-3x+3)=8 x+4x-6=8 5x=8+6 5x=14 x=2.8 4x-3(20-x)=6x-7(9-x) 4x-60+3x=6x-63+7x 7x-60=13x-63 13x-7x=63-60 6x=...

(1)∵(x-3)2+2x(x-3)=0,∴(x-3)(x-3+2x)=0,∴x1=1,x2=3;(2)∵x2-4x+1=0,∴x2-4x=-1,∴x2-4x+4=-1+4,?(x-2)2=3,?x=2±3解得x1=2+3,x2=2?3;(3)化简得,x2+5x+6-20=0,∴x2+5x-14=0,∴(x+7)(x-2)=0,∴x1=2,x2=-7;(4)∵...

1, 5(x-1) = 3-3x 解: 5X-5 = 3-3X 5X+3X = 3+5 8X = 8 X = 1 2,3-2(2x+1)= 2(x-3) 解: 3-4X-2 = 2X-6 -4X-2X = -6-3+2 -6X = -6 X = 1 3, 4x-3(20-x)= 6x-7(9-x) 解: 4X-60+3X = 6X -63 +7X 4X+3X-6X-7X = -63+60 -6X = -3 X = 1...

(1)3x-7+6x=4x-8,3x+6x-4x=-8+7,5x=-1,x=-15.(2)4x-3(20-x)=5x-7(20-x),4x-60+3x=5x-140+7x,4x+3x-5x-7x=-140+60,-5x=-80,x=16.(3)2x?13?2x?34=1,4(2x-1)-3(2x-3)=12,8x-4-6x+9=12,2x=7,x=72.(4)3+0.2x0.2?0.2+0....

(1)移项合并得:9x=6,解得:x=23;(2)去括号得:4x-60+3x=3,移项合并得:7x=63,解得:x=9;(3)去分母得:5(x-1)=20-2(x+2),去括号得:5x-5=20-2x-4,移项合并得:7x=21,解得:x=3;(4)方程整理得:10x+302-4x?105=-2.5,去分母...

解:(1)去括号 4x-60+3x+4=0移项 4x+3x=60-4合并同类项 7x=56 系数化成1 x=8;(2)去分母 2(2x+1)-(5x-1)=6去括号 4x+2-5x+1=6移项 4x-5x=6-2-1合并同类项 -x =3 系数化成1 x=-3。

(1)∵(x-3) 2 +2x(x-3)=0,∴(x-3)(x-3+2x)=0,∴x 1 =1,x 2 =3;(2)∵x 2 -4x+1=0,∴x 2 -4x=-1,∴x 2 -4x+4=-1+4,?(x-2) 2 =3,?x=2± 3 解得 x 1 =2+ 3 , x 2 =2- 3 ;(3)化简得,x 2 +5x+6-20=0,∴x 2 +5x-14=0,∴(x+7)(x...

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