[(y-3x)(-3x-y)-9(x-2y)的平方]除以3y 怎么算?还有:(-x)的5次方除以(-x的2次方) 若3的m次方=a,9的n次方=b,求3的2m-6n+1的值(用含a、b的代数式表示)
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[(y-3x)(-3x-y)-9(x-2y)的平方]除以3y怎么算?还有:(-x)的5次方除以(-x的2次方)若3的m次方=a,9的n次方=b,求3的2m-6n+1的值(用含a、b的代数式表示)[(y
[(y-3x)(-3x-y)-9(x-2y)的平方]除以3y 怎么算?还有:(-x)的5次方除以(-x的2次方) 若3的m次方=a,9的n次方=b,求3的2m-6n+1的值(用含a、b的代数式表示)
[(y-3x)(-3x-y)-9(x-2y)的平方]除以3y 怎么算?
还有:(-x)的5次方除以(-x的2次方)
若3的m次方=a,9的n次方=b,求3的2m-6n+1的值(用含a、b的代数式表示)
[(y-3x)(-3x-y)-9(x-2y)的平方]除以3y 怎么算?还有:(-x)的5次方除以(-x的2次方) 若3的m次方=a,9的n次方=b,求3的2m-6n+1的值(用含a、b的代数式表示)
[(y-3x)(-3x-y)-9(x-2y)^2]÷3y
=[(3x-y)(3x+y)-9(x-2y)^2]÷3y
=[9x^2-y^2-9(x^2-4xy+4y^2)]÷3y
=[9x^2-y^2-9x^2+36xy-36y^2]÷3y
=[9x^2-9x^2+36xy-36y^2-y^2]÷3y
=(36xy-37y^2)÷3y
=12x-37y/3
(-x)^5÷(-x^2)
=-x^5÷(-x^2)
=x^5÷x^2
=x^(5-2)
=x^3
x(x-y)2-(y-x)3
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
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