(1/3x+y)(1/3x-y)(1/9x平方+y平方)用乘法公式计算
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(1/3x+y)(1/3x-y)(1/9x平方+y平方)用乘法公式计算
(1/3x+y)(1/3x-y)(1/9x平方+y平方)用乘法公式计算
(1/3x+y)(1/3x-y)(1/9x平方+y平方)用乘法公式计算
(1/3x+y)(1/3x-y)(1/9x平方+y平方)
=(1/9x平方-y平方)(1/9x平方+y平方)
=1/81x四次方-y四次方
过程中只用了平方差公式
(1/3x+y)(1/3x-y)=九分之一x平方减-y平方然后再与后面那个想成,最终等于81分之1x四次方-y四次方
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计算:(x-y)(1/9x-y)-(1/3x-y)(1/3x+y)
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