用乘法公式计算:24.9²第二题:3(x+2y)²-(x-4y)(x+2y)第三题:(x-1)(x+2)-(2x-3)(2-x)
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用乘法公式计算:24.9²第二题:3(x+2y)²-(x-4y)(x+2y)第三题:(x-1)(x+2)-(2x-3)(2-x)
用乘法公式计算:24.9²
第二题:3(x+2y)²-(x-4y)(x+2y)
第三题:(x-1)(x+2)-(2x-3)(2-x)
用乘法公式计算:24.9²第二题:3(x+2y)²-(x-4y)(x+2y)第三题:(x-1)(x+2)-(2x-3)(2-x)
24.9²=(25-0.1)²=25*25-0.1*0.1=625-0.01=624.99