判断正误并改正①y六次方/y²②(-a-b)²=-a-b③a²-b²=a-b
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判断正误并改正①y六次方/y²②(-a-b)²=-a-b③a²-b²=a-b
判断正误并改正
①y六次方/y²
②(-a-b)²=-a-b
③a²-b²=a-b
判断正误并改正①y六次方/y²②(-a-b)²=-a-b③a²-b²=a-b
答:
①y六次方/y²=y^4
②(-a-b)²=-a-b错误
正确的为:(-a-b)²=(a+b)²
③a²-b²=a-b错误
正确的为:a²-b²=(a-b)(a+b)
①不确定
②×
③×