先化简,再求值(2ab³-4a²b²)÷(2ab)+(3a+b)(3a-b) ,其中a=2,b=(-1)先化简,再求值(2ab³-4a²b²)÷(2ab)+(3a+b)(3a-b) ,其中a=2,b=(-1)
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先化简,再求值(2ab³-4a²b²)÷(2ab)+(3a+b)(3a-b) ,其中a=2,b=(-1)先化简,再求值(2ab³-4a²b²)÷(2ab)+(3a+b)(3a-b) ,其中a=2,b=(-1)
先化简,再求值(2ab³-4a²b²)÷(2ab)+(3a+b)(3a-b) ,其中a=2,b=(-1)
先化简,再求值(2ab³-4a²b²)÷(2ab)+(3a+b)(3a-b) ,其中a=2,b=(-1)
先化简,再求值(2ab³-4a²b²)÷(2ab)+(3a+b)(3a-b) ,其中a=2,b=(-1)先化简,再求值(2ab³-4a²b²)÷(2ab)+(3a+b)(3a-b) ,其中a=2,b=(-1)
原式=b²-2ab+9a²-b²=9a²-2ab=9*2²-2*2*(-1)=40