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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...

(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....

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

①移项合并得:6x=6,解得:x=1; ②去分母得:12-2(2x-5)=3(3-x),去括号得:12-4x+10=9-3x,移项合并得:-x=-13,解得:x=13; ③去括号得:-x+3=6-15x,移项合并得:14x=3,解得:x=314;④去括号得:4x-60+3x=5x-140+7x,移项合并得:5x=80...

(1)去括号得4x-60+3x=3,移项得4x+3x=3+60,合并得7x=63,系数化为1得x=9;(2)去分母得68x-17(2x+1)=4(10x+1)-68,去括号得68x-34x-17=40x+4-68,移项得68x-34x-40x=4-68+17,合并得-6x=-47,系数化为1得x=476.

(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)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...

(1)去括号得:4x-60+3x=-4,整理得:7x=56,解得:x=8;(2)去分母得:3(3x-1)-12=2(5x-7),去括号得:9x-3-12=10x-14,移项得:9x-10x=-14+3+12,合并同类项得:-x=1,方程两边除以-1得:x=-1.

(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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