整式乘除计算题1.(-2a²)(3ab²-5ab³)2.(3y+2)(y-4)-3(y-2
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整式乘除计算题
1.(-2a²)(3ab²-5ab³)
2.(3y+2)(y-4)-3(y-2)(y-3)
3.(2x+y)²-(2x+3y)(2x-3y)
4.(x+2y-3)(x-2y+3)
5.(3x+1)²(3x-1)²
1.(-2a²)(3ab²-5ab³)
2.(3y+2)(y-4)-3(y-2)(y-3)
3.(2x+y)²-(2x+3y)(2x-3y)
4.(x+2y-3)(x-2y+3)
5.(3x+1)²(3x-1)²
![整式乘除计算题1.(-2a²)(3ab²-5ab³)2.(3y+2)(y-4)-3(y-2](/uploads/image/z/17383599-63-9.jpg?t=%E6%95%B4%E5%BC%8F%E4%B9%98%E9%99%A4%E8%AE%A1%E7%AE%97%E9%A2%981.%28-2a%26%23178%3B%29%283ab%26%23178%3B-5ab%26%23179%3B%292.%283y%2B2%29%28y-4%29-3%28y-2)
1.(-2a²)(3ab²-5ab³)
=-6a³b²+10a³b³
2.(3y+2)(y-4)-3(y-2)(y-3)
=3y²-10y-8-3(y²-5y+6)
=3y²-10y-8-3y²+15y-18
=5y-26
3.(2x+y)²-(2x+3y)(2x-3y)
=4x²+4xy+y²-(4x²-9y²)
=4x²+4xy+y²-4x²+9y²
=4xy+10y²
4.(x+2y-3)(x-2y+3)
=[x+(2y-3)]×[x-(2y-3)]
=x²-(2y-3)²
=x²-(4y²-12y+9)
=x²-4y²+12y-9
5.(3x+1)²(3x-1)²
=[(3x+1)(3x-1)]²
=(9x²-1)²
=(81x^4)-18x²+1
=-6a³b²+10a³b³
2.(3y+2)(y-4)-3(y-2)(y-3)
=3y²-10y-8-3(y²-5y+6)
=3y²-10y-8-3y²+15y-18
=5y-26
3.(2x+y)²-(2x+3y)(2x-3y)
=4x²+4xy+y²-(4x²-9y²)
=4x²+4xy+y²-4x²+9y²
=4xy+10y²
4.(x+2y-3)(x-2y+3)
=[x+(2y-3)]×[x-(2y-3)]
=x²-(2y-3)²
=x²-(4y²-12y+9)
=x²-4y²+12y-9
5.(3x+1)²(3x-1)²
=[(3x+1)(3x-1)]²
=(9x²-1)²
=(81x^4)-18x²+1
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