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初二数学化简难题

1. -9(x-2)-y(x-5) 当x=5,y=12时,求式子的值. 2. 5(9+a)*b-5(5+b)*a 当a=5/7时,求式子的值. 3. 62g+62(g+b)-b 当g=5/7,b=16时,求式子的值. 4. 3(x+y)-5(4+x)+2y 当x=9,y=2时

呵呵,我也是初二的.要30道实在太多,把我们这学期的数学教案发给你,你自已挑选吧,总会有你想要的,帮到的忙不大,还是想尽量帮你. 虽然没有答案,但是挑些简单

x+1+y+1=0 x+1/y+1=-1 答案 -2

1、已知a,b是方程x^2+2x-5=0的两个实数根, 求(a^2+2ab+2a)(b^2+2ab+2b)的值. 由a,b是方程x^2+2x-5=0的两个实数根得: ab=-5,a+b=-2 a^2+2ab+2a)(b^2+2ab+2b) =ab(a+2b+2)(b+2a+2) =-5(-2+b+2)(-2+a+2) =-5ab =25 2、1/2(x+y+z)方+

(1) 化简求值:已知3x2y[2x2y3(2xyx2y)xy],其中x=1,y=2. (2)化简求值:2ab23a2b2(a2bab2),其中a=1,b=2. (3)化简求值:2(a5-7b)3(-3a5+4b),其中a=1,b=2. (4)化简求值:5(2x7y)3 (4x10y).其中x=1,y=.

应该是(a√a+b√b)/(a-√ab+b),或(a√a-b√b)/(a+√ab+b)吧.(√a+√b)/(a-√ab+b)=(√a+√b)(a-√ab+b)/(a-√ab+b)=√a+√b;(√a-√b)/(a+√ab+b)=(√a-√b)(a+√ab+b)/(a+√ab+b)=√a-√b.

没有!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

1. a+b-(a-b)2. (x+y)-(x-y)3.3ab-4ab+8ab-7ab+ab=______. 4.7x-(5x-5y)-y=______. 5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______. 6.-7x2+6x+13x2-4x-5x2=______. 7.2y+(-2y+5)-(3y+2)=_

1 化简或求值:若解x的分式方程2/(x-2)+mx/(x^2-4)=3/(x+2)会产生增根,求m的值 化简或求值:若解关于x的分式方程2/(x-2)+mx/(x^2-4)=3/(x+2)会产生增根,求m的值答案: 2/(x-2)+mx/(x^2-4)=3/(x+2) 2(x+2)/(x^2-4)+mx

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