1.x2y2 - 2x2y - 3xy2 2.– 3a2x2 + 3ax2 - 6ax3
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1.x2y2 - 2x2y - 3xy2 2.– 3a2x2 + 3ax2 - 6ax3
3.- 3m2n2 – 3mn2 - 9mn 4.x(x - y) + y(y - x)
5.9a2 - 4b2 6.(x + a)2 - (x – a)2
7.b2 – 6b + 9 8.m2 – 8mn + 16n2
9 (a + b)2 + 2(a + b) + 1 10 .ax2 - 2axy + ay2
3.- 3m2n2 – 3mn2 - 9mn 4.x(x - y) + y(y - x)
5.9a2 - 4b2 6.(x + a)2 - (x – a)2
7.b2 – 6b + 9 8.m2 – 8mn + 16n2
9 (a + b)2 + 2(a + b) + 1 10 .ax2 - 2axy + ay2
1. x²y² - 2x²y - 3xy²
=xy(xy-2x-3y)
2. – 3a²x² + 3ax² - 6ax³
=-3ax²(a-1+x)
3. - 3m²n² – 3mn² - 9mn
=-3mn(mn+n+3)
4. x(x - y) + y(y - x)
=x(x-y)-y(x-y)
=(x-y)(x-y)
=(x-y) ²
5. 9a² - 4b²
=(3a-2b)(3a+2b)
6. (x + a) ² - (x – a) ²
=(x+a+x-a)(x+a-x+a)
=4xa
7. b² – 6b + 9
=(b-3) ²
8. m² – 8mn + 16n²
=(m-4n) ²
9 (a + b) ²+ 2(a + b) + 1
=(a+b+1) ²
10 . ax² - 2axy + ay²
=a(x²-2xy+y²)
=a(x-y) ²
=xy(xy-2x-3y)
2. – 3a²x² + 3ax² - 6ax³
=-3ax²(a-1+x)
3. - 3m²n² – 3mn² - 9mn
=-3mn(mn+n+3)
4. x(x - y) + y(y - x)
=x(x-y)-y(x-y)
=(x-y)(x-y)
=(x-y) ²
5. 9a² - 4b²
=(3a-2b)(3a+2b)
6. (x + a) ² - (x – a) ²
=(x+a+x-a)(x+a-x+a)
=4xa
7. b² – 6b + 9
=(b-3) ²
8. m² – 8mn + 16n²
=(m-4n) ²
9 (a + b) ²+ 2(a + b) + 1
=(a+b+1) ²
10 . ax² - 2axy + ay²
=a(x²-2xy+y²)
=a(x-y) ²
(2x2y-2xy2)-[(-3x2y2+3x2y)+(3x2y2-3xy2)],其中x=-1,y=2.
化简并求值:(2x2y-2xy2)-[(-3x2y2+3x2y)+(3x2y2-3xy2)],其中x=−12,y=2
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2
单项式5x2y,3x2y2,-4xy2的和为______.
一个多项式加上x2y-3xy2得2x2y-xy2,则这个多项式是( )
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先化简,再求值(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
计算:3xy(x2y-xy2+xy)-xy2(2x2-3xy+2x)因式分解
已知A=x3-2y3+3x2y+xy2-3xy+4,B=y3-x3-4x2y-3xy-3xy2+3,C=y3+x2y+2
计算(3xy2-6x2y)÷(-2x)= ___ .
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