解10x-x=63-搜答案-搜搜考试网

X+X-10+X-2=36*33x-12=1083x=120x=40

-3x(x-10)=63

-3x^2+30x=63-3x^2+30x-63=0x^2-10x+21=0(x-7)(x-3)=0x-7=0x=7x-3=0x=3

0.5x=15x=30再答：0.2x=10x=50再答：4.5x=9x=2再问：能写内容

x+25%x=10x+0.25x=101.25x=10x=8x-75%x=2.5x-0.75x=2.50.25x=2.5x=10128%x-x=2.81.28x-x=2.80.28x=2.8x=10

因为：(x^2-8)/(x^2-10)=(x^2-3x+2)/(x^2-3x)所以：[(x^2-8)-(x^2-10)]/(x^2-10)=[(x^2-3x+2)-(x^2-3x)]/(x^2-3x)

(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=(x/2)*(2/x(x+2))+(2/(x+2)(x+4))+.+2/(x+8)(x+10)=(x/2)*[1/x

5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/(x-2)(x+3)+(2x-5)/(x+3)(x-4)=(7x-10)

1/x(x+1)+1/(x+1)(x+2)+...+1/(x+9)(x+10)=1/(x+10),1/x(x+1)+1/(x+1)(x+2)+...+1/(x+9)(x+10)=1/x-1/(x+1)

(5-2x)/(x^2-x-12)=5x/(x^2+x-6)+(10-7x)/(x^2-6x+8)(5-2x)/(x-4)(x+3)=5x/(x+3)(x-2)+(10-7x)/(x-2)(x-4)分

x/2（1/1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)=1x/2*10/11=110x=22x=11/5这回的方法是你想要的了吧

(1)(X+7)/(X+6)+(X+9)/(X+8)=(X+10)/(X+9)+(X+6)/(X+5)这类方程重在运算的技巧性,观察分母7+9=10+6;6+8=5+9所以先移项:(X+7)/(X+6

（2x+5)(4x*x-10x+25)=8x(x*x+1)8x^3-20x^2+50x+20x^2-50x+125=8x^3+8x,8x=125,x=125/8或利用立方和公式8x^3+125=8x^

自己算吧

再答：望采纳

5x/(x²+x-6)+(2x-5)/(x²-x-12)=(7x-10)/(x²-6x+8)5x/[(x+3)(x-2)]+(2x-5)/[(x-4)(x+3)]=(7x

解题思路：高次方程的解法分解因式解题过程：

应该是2或-5

x+62/x+63+x+68/x+69=x+63/x+64+x+67/x+68可以把x+62看做x解得x=-4所以x+62=-4x=-66

设原盐水中x千克20%x=(10+X)*15%20%x=1.5+15%20%x-15%x=1.55%x=1.5x=1..5÷5%x=1.5×20x=30千克盐水共重30千克盐水中有盐30×20%=6千

X-0.75X=三分之一X-10则0.25x=(x-10)/3则0.25x*3=x-10则10=x-0.75x则0.25x=10所以x=40