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解方程 x%7x69=5x1.2x

(1)方程两边同乘(x+1)(x-1),得3(x+1)=5(x-1),整理得3x+3=5x-5,解得:x=4.检验:将x=4代(x+1)(x-1)≠0.∴x=4是原方程的解(2)方程两边同乘x(x+1)(x-1),得:7(x-1)+(x+1)=6x,整理得:8x-6=6x,解得:x=3.经检验:x=3...

(1)方程两边同乘(x+1)(x-1),得3(x+1)=5(x-1),整理得3x+3=5x-5,解得:x=4.检验:将x=4代(x+1)(x-1)≠0.∴x=4是原方程的解(2)方程两边同乘x(x+1)(x-1),得:7(x-1)+(x+1)=6x,整理得:8x-6=6x,解得:x=3.经检验:x=3...

(1)x(3+5x)=0,∴x1=0,x2=-?35;(2)(3-x)(7x+4)=0,∴x1=3,x2=-47;(3)去分母整理得4x2-16x+12=0,即x2-4x+3=0,(x-3)(x+1)=0,∴x1=3,x2=-1,经检验x1=3,x2=-1是原方程的根.所以原方程的根为x1=3,x2=-1.

x1=-1 x2=1 x3=-1 x4=1 x5=-1

x/2+2(5x/4+1)=8+x x/2+5x/2+2=8+x 3x-x=8-2 2x=6 x=3 如有帮助请采纳, 如对本题有疑问可追问,Good luck!

因题干条件不完整,缺题干,不能正常作答

(1)7x-5x=4+8,2x=12,x=6;(2)4(3x-2)+40=5(x+6),12x-8+40=5x+30,7x=-2,x=-27.

1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)+1/(x+4)=3/2 1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)+1/(x+3)-1/(x+4)+1/(x+4)=3/2 1/(x+1)=3/2 x+1=2/3 x=-1/3

3(5x-1)=6(3x-1)-4(2-x) 15x-3=18x-6-8+4x -7x=-11 x=11/7

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