单项式:5x2y,-6x2y,34x
单项式:5x2y,-6x2y,34x
单项式5x2y、3x2y、-4x2y的和为______.
当x=2011,y=2012时,求代数式3x3-4x3y2+3x2y+2x2+4x3y2+2x2y-5x2-5x2y+x
单项式-3x2减去单项式-4x2y,-5x2,2x2y的和,列算式为______,化简后的结果是______.
当x+y=5 xy=6 (x2y)(xy2)=?
若x+y=5,xy=6,则x2y+xy2的值为______.
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2
先化简后求值:4x2y-[6xy-3(4xy-2)-x2y]+1,其中x=2,y=-12
当x=-1,y=1时求代数式2x2y-(5xy2-3x2y)-x2的值
单项式5x2y,3x2y2,-4xy2的和为______.
如果(3x2y-2xy2)÷m=-3x+2y,则单项式m为( )
2(x2y+xy)-3(x2y+xy)-4x2y其中x=-2,y=12