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解方程 2.5: 1 4 =x:3 2 5 ...

(1) 2.5: 1 4 =x:3 , 1 4 x=2.5×3, 1 4 x÷ 1 4 =2.5×3÷ 1 4 , x=2.5×3×4, x=30;(2) 2 5 (x- 1 4 )= 7 10 , 2 5 (x- 1 4 )÷ 2 5 = 7 10 ÷ 2 5 , x- 1 4 = 7 4 , x- 1 4 + 1 4 = 7 4 + 1 4 , x=2;(3) 3 4 x+20%x=19 , 0.95x...

解方程: (1)4/2x一3=5/2x; 5(2x-3)=8x 10x-15=8x 2x=15 x=7.5 经检验,x=7.5是分式方程的根 (2)x/2x一3十5/3一2x=4 x/(2x-3)-5/(2x-3)=4 x-5=4(2x-3) x-5=8x-12 7x=7 x=1 经检验,x=1是分式方程的根

(x+3)/(x+2)+(x+4)/(x+3)=(x+5)/(x+4)+(x+2)/(x+1) 1+1/(x+2)+1+1/(x+3)=1+1/(x+4)+1+1/(x+1) x+3+x+2/(x+2)(x+3)=x+1+x+4/(x+4)(x+1) 2x+5/(x+2)(x+3)=2x+5/(x+4)(x+1) (1)2x+5不为0 (x+2)(x+3)=(x+4)(x+1) x^2+5x+...

(1)去括号得:8x+12=8-8x-5x+10,移项,合并同类项得:21x=6,系数化1得:x=27;(2)整理可得:10x?103-10x+205=1.2去分母得:50x-50-30x-60=18,解得:x=6.4.

2.5/0.25x=2.5 0.25x=2.5/2.5 0.25x=1 x=1/0.25 x=4

1+1/(x-1)+1+1/(x-4)=1+1/(x-2)+1+1/(x-3) 1/(x-1)+1/(x-4)=1/(x-2)+1/(x-3) (2x-5)/(x-1)(x-4)=(2x-5)/(x-2)(x-3) 因此2x-5=0, 得:x=5/2 或(x-1)(x-4)=(x-2)(x-3)=0, 得:x^2-5x+4=x^2-5x+6, 不符。 故只有一解为x=5/2

(1)7y+5y=10-2612y=-16y=-34;(2)5x+10=-10x+25x+10x=2-1015x=-8x=-815;(3)2(2x+1)-(5x-1)=64x+2-5x+1=64x-5x=6-2-1-x=3x=-3;(4)x?22-2(x+1)=1.5x-2-4(x+1)=3x-2-4x-4=3-3x=9x=-3.

第四题是x(3.5+2.6)=12.2. 6.1x=12.2 6.1除6.1=12.2除6.1x=你自己算吧

(x-1/4)*(2/5=1/5 2*(x-1/4)=1 x=1/2+1/4=3/4. 2.5x*4=7.2 10x=7.2 =7.2/10 x =0.72. 5x/8-2/5=2/5. 5x/8=2/5+2/5 =4/5. x=(4/5)*(8/5) =32/25. (即x=1.28) (3/4)+(1/3)-2x/5=1/12. (3*3)/12+1*4/12-2x/5=1/12. 2x/5=(9+4)/12-(1/12. =13/12-1/1...

(1),x1=2+根号3,x2=2-根号3 (2),x等于正负根号下7 (3),x1=0,x2=4 (4),x1=-1,x2=6 (5),x=-2 (6),无解

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