1、(2x+3y)(3x-5y)-(x+y)(6x-7y)2、(2a-b+c)(b-c-2a)3、简便运算 99.8^24、简便运算 (10+1)(10^2+1)(10^4+1)(10^8+1)5\ 6(x+y)^2-2(x-y)(x+y)请勿灌水.

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/02 22:23:35
1、(2x+3y)(3x-5y)-(x+y)(6x-7y)2、(2a-b+c)(b-c-2a)3、简便运算 99.8^24、简便运算 (10+1)(10^2+1)(10^4+1)(10^8+1)5\ 6(x+y)^2-2(x-y)(x+y)请勿灌水.
xT;N1ʖWسd8VJQn :n(h"r> ?qA:d8~oF'}yM Y@IY60CfOpJ8zqz[]7IUQgzJ֪9\'%wY-wۇ^gǃ*q=q;4;vsmd% ([LdC5zTi./X_nȤkV Dz!h-( RxJrEG*m NI솱Yu>*bBݦt_jb;Qz[ca% w~@K1EާsH5; =o9$̧Gcw^zt D{B#dGCt e*WJP& 1U$Wk{?R=ӯWOa{7kQrEO

1、(2x+3y)(3x-5y)-(x+y)(6x-7y)2、(2a-b+c)(b-c-2a)3、简便运算 99.8^24、简便运算 (10+1)(10^2+1)(10^4+1)(10^8+1)5\ 6(x+y)^2-2(x-y)(x+y)请勿灌水.
1、(2x+3y)(3x-5y)-(x+y)(6x-7y)
2、(2a-b+c)(b-c-2a)
3、简便运算 99.8^2
4、简便运算 (10+1)(10^2+1)(10^4+1)(10^8+1)
5\ 6(x+y)^2-2(x-y)(x+y)
请勿灌水.

1、(2x+3y)(3x-5y)-(x+y)(6x-7y)2、(2a-b+c)(b-c-2a)3、简便运算 99.8^24、简便运算 (10+1)(10^2+1)(10^4+1)(10^8+1)5\ 6(x+y)^2-2(x-y)(x+y)请勿灌水.
1.(2*3-1*6)x^2+(-5*2+3*3+1*7-1*6)xy-(3*5-1*7)y^2=-8y^2
2.(2a-b+c)(b-c-2a)=(2a-b+c)*-(2a-b+c)=-(2a-b+c)^2
3.99.8^2=(100-0.2)^2=100^2-2*100*0.2+0.2^2=10000-40+0.04=9960.04
4.11 101 (10^4+1)=10^2^2+1=100^2+1=10001
(10^8+1)=10^2^2^2+1=100^2^2+1=10000^2+1=100000001
5.6(x+y)^2-2(x-y)(x+y)=6(x+y)^2-2(x^2-y^2)
=6(x+y)^2-2x^2+^2y^2
=(6-2)x^2+(6*2)xy+(6+2)y^2
=4x^2+12xy+8y^2
=(2x+4y)(2x+2y)

(2*3-1*6)x^2+(-5*2+3*3+1*7-1*6)xy-(3*5-1*7)y^2=-8y^2
-(2a-b+c)(2a-b+c)=-(2a-b+c)^2
100^2+0.2^2-2*0.2=10000+0.04-0.4=999.64
(6+1)x^2+(6-1)y^2+12xy=7x^2+5y^2+12xy

2. (2a-b+c)(b-c-2a)
=(2a-b+c)[-(2a-b+c)]
=-(2a-b+c)^2
3. 99.8^2
=(100-0.2)^2
=100^2+0.2^2-2*100*0.2

(x-y)^3×(y-x)^4+(x-y)^2×(y-x)^5 -(5x+y)-7(x-y) -2分之1(x+y)+4分之1(x+2y) 4x-2(x-2) -2x-(3x-1) x-(5x-2y)+2(2x-y) 2(x-y)²-3(x-y)(-y-x) 2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y) 1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/(x^2-5x+6)+(x^2-3x+8)/(x^2-4x+3)2.{(x^2)/(x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{(x^2/x^2+y^2)^2} 3(x-1)³y-(1-x)³z m(x-y)²-x+y x²(x+y)(y-x)-xy(x+y)(x-y) 因式分解 10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组) x²-y²+5x+3y+4(x+y-2xy)(x+y-z)+(xy-1)² 先化简,再求值 [2/3x - 2/x+y(x+y/3x -x-y)]*x/x-y,其中5x+3y=0 化简 求值 x-{-5x-[-y+(-x+3y)+x]},其中x=-1,y=-2; [(x+y)(x-y)-(x-y)的平方+2y(x-y)]除以(4y)请帮我一下写两道计算题[(x+y)(x-y)-(x-y)的平方+2y(x-y)]除以(4y)[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以(4x) (x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)(2)(3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x 5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值; y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3 ((x+2y)x^2+(x-y)(3x-y)-5y^2)÷2x 多项式成多项式(一):(-4X-Y)(-5X+2Y)(二):(Y-1)(Y-2)(Y-3)(三):(2x+3y)(3x-2y)(四):(x+2)(x+3)-(x+6)(x-1)(五):(3x+2y)(2x+3y)-(x-3y)(3x+4y) (1)x(x+10)-2(3x-2) 分解因式y(2y+1)-y(y-1)+1 2x(2x-y)+y(y-2x) 2y(y-2)-y(y-4)-1 x(x+8)-8(x+2) (a+2)(a-2)-5 (x-3)(a-2)-5 (x+3)(x+4)+4分之1 若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )