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整式练习题

3ab-4ab+8ab-7ab+ab=______.7x-(5x-5y)-y=______.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.-7x2+6x+13x2-4x-5x2=______.2y+(-2y+5)-(3y+2)=______.(2x2-3xy+4y2)+(x2+2xy-3y2)=______.2a-(3a-2b+2)+(3a-4b-1)=______.-6x2-7x2+15x2-2x2=______....

1.3ab-4ab+8ab-7ab+ab=______. 2.7x-(5x-5y)-y=______. 3.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______. 4.-7x2+6x+13x2-4x-5x2=______. 5.2y+(-2y+5)-(3y+2)=______. 6.(2x2-3xy+4y2)+(x2+2xy-3y2)=______. 7.2a-(3a-2b+2)+(3a-4b-1)...

3 ,m=5,n=1; 4,m=2,n=2或-2 5,x^2-5 6,m=0且m不等于1 7,2013 8,-2 9,m=3,n=4 10,3

(1)y²×y³×y^4 =y^(2+3+4) =y^9 (2)(-2a²b)³ =-8a^6b^3. (3)-1/2xy²×2/3x²y =(-1/3)x³y³ (4)(-2x)(4xy-y²) =-8x²y+2xy² (5)4x²×(x²-1/2x-1) =4x^4-2x²-4x² (6)2a(...

1、若x^2-2x-1=0 求x^4+x^3-5x^2-7x+5=? 2、若x^2-3x+1=0 qiu x^4+x^-4 =? 1.-2(-2^2)^3*(1/6)^3= 2.2x^3*3x^4= 3.27/64a^3b^3x^6=( )^3 4.x^2 () 1/4=( )^2 5.(x+3)(2x-5)-(2x+1)(x-8)=41 解是( )直接答案 填空题 参考答案...

1、a+(2b-3c-4d)=_________;2、a-(-2b-3c+4d)=________;3、(m-n)-3(z-p)=________;4、3x-[5x-(2x-1)]=________;5、4x2-[6x-(5x-8)-x2]=___________;二、化简(28分)1、(1)(3x+5y)+(5x-7y)-2(2x-4y);(2)5ab-{1、a+(2b-3c-4d)=2、a-(-2b-3c+4...

DAADC

求证不论x、y取何值,代数式x^2+y^2+4x-6y+14的值总是正数。x^2+y^2+4x-6y+14= x^2+ 4x + 4+y^2-6y+9+1=(x+2)^2+(y-3)^2+1∵ (x+2)^2≥0,(y-3)^2 ≥0∴ (x+2)^2+(y-3)^2+1>0即原式的值总是正数。

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