(-3ab)^2*(a^2+ab-b^2)-3a^2b^2(3a^2+3ab+b^2),其中a=-4/3,b=-3/21.6整式的乘法(2)
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(-3ab)^2*(a^2+ab-b^2)-3a^2b^2(3a^2+3ab+b^2),其中a=-4/3,b=-3/21.6整式的乘法(2)
(-3ab)^2*(a^2+ab-b^2)-3a^2b^2(3a^2+3ab+b^2),其中a=-4/3,b=-3/2
1.6整式的乘法(2
)
(-3ab)^2*(a^2+ab-b^2)-3a^2b^2(3a^2+3ab+b^2),其中a=-4/3,b=-3/21.6整式的乘法(2)
解
(-3ab)²(a²+ab-b²)-3a²b²(3a²+3ab+b²)
=9a²b²(a²+ab-b²)-3a²b²(3a²+3ab+b²)
=(9a^4b²-9a^4b²)+(9a³b³-9a³b³)+(9a²b^4-3a²b^4)
=6a²b^4
=6×(-4/3)²×(-3/2)^4——是a=负四分之3还是3分之4
=6×(16/3)×(81/16)
=6×27
=162
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