A.2x2+3x2=5x2 | B.2x3-3x3=-1 | ||
C.2x2•3x2=6x4 | D.2x3÷3x3=
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A.(x3y4)÷(xy) | B.(x2y3)•(xy) | C.(x3y2)•(xy2) | D.(-x3y3)÷(x3y2) |
A.(2xy2-3xy)•2xy=4x2y2-6x3y | ||||||||
B.-x(2x+3x2-2)=-3x3-2x2-2x | ||||||||
C.-2ab(ab-3ab2-1)=-2a2b2+6a2b3-2ab | ||||||||
D.(
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