很小的题目,望详解.(x-4y)²+___________=(x+4y)²(m+n)² -
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很小的题目,望详解.
(x-4y)²+___________=(x+4y)²
(m+n)² - ___________=(m-n)²
x²-x+( )=( )²
x²-6xy+( )=( )²
(3x+___________)=_______+12xy+________
若4x²-Mxy+9y²是两数和的平方,M值为____
(x-4y)²+___________=(x+4y)²
(m+n)² - ___________=(m-n)²
x²-x+( )=( )²
x²-6xy+( )=( )²
(3x+___________)=_______+12xy+________
若4x²-Mxy+9y²是两数和的平方,M值为____
(x+4y)^2=x^2+8xy+16y^2 (x-4y)^2=x^2-8xy+16y^2
(x-4y)²+16xy=(x+4y)²
(m+n)² -4mn=m^2+n^2+2mn-4mn=m^2+n^2-2mn=(m-n)²
x²-x+1/4=(x-1/2)²
x²-6xy+9y^2=(x-3y)²
(3x+2y)=9x^2+12xy+4y^2
(2x-3y)^2=4x^2-12xy+9y^2 M=12
(x-4y)²+16xy=(x+4y)²
(m+n)² -4mn=m^2+n^2+2mn-4mn=m^2+n^2-2mn=(m-n)²
x²-x+1/4=(x-1/2)²
x²-6xy+9y^2=(x-3y)²
(3x+2y)=9x^2+12xy+4y^2
(2x-3y)^2=4x^2-12xy+9y^2 M=12
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如果x-3y=2m,x+3y=n,那么2x-4y的值等于多少?(用m、n的代数式表示)
已知集合M={(x,y)|x+y=2},N={(x,y)|x-y=4},则M∩N等于______.