5x^2-6x+1-(______)=7x+8

5x^2-6x+1-(______)=7x+8 已知x²+3x+5=7,则式子1-2x²-6x的值为______ 急.求个好人.先提一提,^ 表示次方的意思.嘻嘻..① 5x-2=3x+4两边______,根据______得______=3x+6,两边______,根据______得2x=________,两边______,根据______得x=_________.②若方程3x-2=2x-1与方程(3x-2)-7=(2x-1)+k的解 若(5x+y)(7x+10y)=1/2,则x/y=______;若x+1/x=3,则x^2+1/x^2 x-2x=3,则5x-10x+1=______ . 1、（a+b)²（a-b)²=______.2、(x+2y-3z)(x-2y+3z)=______.3、(-x²+y²)²=______.4、x²+______-8x²-1=2（x的三次方）+7x-3.5、若x²+mx+4是完全平方式,则m=______.6、a的m次方=3,a的n次方=5,则a的2 高手come in(1.)x²-5x+6=______(2.)z²+6z-7=______(3)2x²-7x+3=_____(4)2m²+mn-n²=______(5)-x²+3x-2______(6)x的4次方-x²-12________ 2X-9 2X^2-3X+7①Y= ______ ②Y= __________ ③ X(3-X)≤X(X+2)-12X+5 2X^2-3X+12X-9 2X^2-3X+7①Y= ______ ②Y= __________ ③ X(3-X)≤X(X+2)-12X+5 2X^2-3X+1 x为______时,式子|7x+6)(3x-5)|=(7x+6)(3x-5)成立? 分式方程3/x+6/x-1=7/x^-x的解为x=______ 若x^2+3x-1=0,则x^3+5x^2+5x+18=______ 已知f(x)=(2x+5)/(x-1)(x∈R,x≠1)的反函数是______. 2x（x-1）-x（2x-5）=12的x值为______ 急 方程（x+1）/(x+2) + (x+8)/(x+9)=（x+2）/(x+3）+（x+7)/(x+8)的解是______ 已知2x+3y=-1,且5x-6y=10,则x=______. 解方程:3/x+6/x-1=5/x^2-x5/x=7/x-2(x-1/x+1)-(4/x^2-1)=1填空:当x=______时,分时3/x^2-1有意义分式0.01x-0.5y/2x+0.03y化为整系数为_________.分式x^2-4/x+4的值为0,则x的值为________化简(x/x-2-x/x+2)除以4x/2-x的结果是______ *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 字母求值题来的若x-1/(x^2-5x+6)=a/(x-2)+b/(x-3)则a=______,b=_______