整式
-(a的平方-2ab)*9a的平方-(9ab的三次方+12a的四次方b的平方)除以3ab,其中a=-1,b=-2
-(a²-2ab)*9a²-(9ab³+12a^4b²)/3ab =-(1-2×2)*9-(9×8+12×4)/3×2 =27-20 7
-(a^2-2ab)*9a^2-(9ab^3+12a^4b^2)/3ab =-9a^4+18a^3b-3ab(3b^2+4a^3b)/3ab =-9a^4+18a^3b-3b^2-4a^3b =-9a^4+14a^3b-3b^2 =-9(-1)^4+14(-1)^3(-2)-3(-2)^2 =-9+28-12 =7
答:(1)原式=8a³b^4÷(12a³b²) =(2/3)b² (2)原式=4x²+4xy+y²-(4...详情>>
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