计算 ①(3x-2y)²+(3x+2y)²②4(x-1)·(x+1)-(2x+3)²
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计算 ①(3x-2y)²+(3x+2y)²②4(x-1)·(x+1)-(2x+3)²
计算 ①(3x-2y)²+(3x+2y)²
②4(x-1)·(x+1)-(2x+3)²
计算 ①(3x-2y)²+(3x+2y)²②4(x-1)·(x+1)-(2x+3)²
原式=9x²-12xy+4y²+9x²+12xy+4y²
=18x²+8y²
原式=4x²-4-4x²-12x-9
=-12x-13
①=18x²+8y²
②=4x²-4-4x²-9-12x
=-12x-13
原式=9x²-12xy+4y²+9x²+12xy+4y²
=18x²+8y²