3(xy2-x2y)-2(xy+xy2)+3x2y;5a的平方-[a的平方+(5a²-2a)-2(a²-3a)]5ab-2[3ab-(4ab²+1/2ab)]-ab²的值,其中a=1/2,b=2/3
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3(xy2-x2y)-2(xy+xy2)+3x2y;5a的平方-[a的平方+(5a²-2a)-2(a²-3a)]5ab-2[3ab-(4ab²+1/2ab)]-ab
3(xy2-x2y)-2(xy+xy2)+3x2y;5a的平方-[a的平方+(5a²-2a)-2(a²-3a)]5ab-2[3ab-(4ab²+1/2ab)]-ab²的值,其中a=1/2,b=2/3
3(xy2-x2y)-2(xy+xy2)+3x2y;5a的平方-[a的平方+(5a²-2a)-2(a²-3a)]
5ab-2[3ab-(4ab²+1/2ab)]-ab²的值,其中a=1/2,b=2/3
3(xy2-x2y)-2(xy+xy2)+3x2y;5a的平方-[a的平方+(5a²-2a)-2(a²-3a)]5ab-2[3ab-(4ab²+1/2ab)]-ab²的值,其中a=1/2,b=2/3
3(xy^2-x^2y)-2(xy+xy^2)+3x^2y
=3xy^2-3x^2y-2xy-2xy^2+3x^2y
=xy^2-2xy
5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
=5a^2-(a^2+5a^2-2a-2a^2+6a)
=5a^2-(4a^2-4a)
=a^2-4a
5ab-2[3ab-(4ab²+1/2ab)]-ab²的值,其中a=1/2,b=2/35ab-2[3ab-(4ab²+1/2ab)]-ab²=5ab-5ab+8ab²-ab²=7ab²其中a=1/2,b=2/37ab²=7*1/2*(2/3)²=14/9
3x2y+xy2-[2xy2-4x2y+(x2y-2xy2)]
-2x2y(-2xy2)2+(2xy)3×( xy2)
5xy2-【3xy2-(4xy2-2x2y)】+2x2y】+2x2y-xy2 化简,再求值
(X3-2x2y+xy2)÷(x3-xy2)要求约分
求[2(x2y-xy2)+xy(2xy-x2)]÷x2y注:x2 xy2 x2y中的2是平方,我不会打平方的符号
计算:3xy(x2y-xy2+xy)-xy2(2x2-3xy+2x)因式分解
-3x2y+2x2y+3xy2-2xy2
(-1/2x2y)`(-3xy2)=
4xy2-4x2y-y3 (2 3 是方)
-3x2+2x2y+xy2
(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
x.y取何值时,代数(x3y+3x2y-5xy2+6y3)+(y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3).y取何值时,代数(x3y+3x2y-5xy2+6y3)+(y3+2xy2+x2y-2x3)-(4x2y-x3-3xy2+7y3)的值都是常数?
(6x2y-xy2-1/2x2y3)/(-3xy)
已知(x+3)2+▕x-y+10▏=0求代数式5x2y-【2x2-(3xy-xy2)-3x2】-2xy2-y2的值.
已知(x+3)2+▕x-y+10▏=0求代数式5x2y-【2x2-(3xy-xy2)-3x2】-2xy2-y2的值.
(x2y)3 × (-xy2)3
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2 在此题中2是x或y的平方(2次方)
23.先化简再求值:3x2y-[2xy2-4(1/2xy-3/4x2y)+xy]+3xy2,其中x=3,y=-1