①3x²+6xy+3y²

咖喱茄子2022-10-04 11:39:542条回答

①3x²+6xy+3y²
②1-x+x²/4
③-4a²x²+12ax-9
④(a-2b)²-14(a-2b)+49
⑤(a+b)²-4ab
⑥(x-y)²-4(x-y-1)

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生命良方 共回答了26个问题 | 采纳率80.8%
①3(x²+2xy+y²)=3(x+y)²
②﹙1/2x-1﹚²
③﹣(2ax-3)²
④(a-2b-7)²
⑤(a-b)²
⑥(x-y-2)²
1年前
retretret 共回答了1146个问题 | 采纳率
①3x²+6xy+3y²=3(x+y)²
②1-x+x²/4=(1/4)(x-2)²
③-4a²x²+12ax-9 = -(2ax-3)²
④(a-2b)²-14(a-2b)+49=(a-2b-7)²
⑤(a+b)²-4ab=(a-b)²
⑥(x-y)²-4(x-y-1)=(x-y-2)²
1年前

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已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
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因为,x - y = 3xy
所以:-3x+6xy+3y/[(7x-5y)-9xy-(3x-y)]
= [-3(x-y)+6xy]/[(7x-5y) - 9xy - (3x-y)]
= [ -3*3xy + 6xy]/ [ 7x - 5y - 9xy - 3x + y]
= -3xy/ [ 4x -4y -9xy]
= -3xy/[4(x-y)-9xy]
= -3xy/[4*3xy-9xy]
= -1
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16-x²分之4x-x² =x(4-x)/[(4-x)(4+x)]=x/(x+4)
3x²+6xy+3y²分之x²-y平方
=(x+y)(x-y)/[3(x+y)²]
=(x-y)/﹙3x+3y)
①3x²+6xy+3y²②81(m+n)²-16(m-n)²③4x²(
①3x²+6xy+3y²②81(m+n)²-16(m-n)²③4x²(x-y)+(y-x)
④16x的四次方-8x²y²+y四次方
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正巧qmx 共回答了18个问题 | 采纳率94.4%
①3x²+6xy+3y²
=3(x²+2xy+y²)
=3(x+y)²
②81(m+n)²-16(m-n)²
=[9(m+n)]²-[4(m-n)]²
=(9m+9n+4m-4n)(9m+9n-4m+4n)
=(13m+5n)(5m+13n)
③4x²(x-y)+(y-x)
=4x²(x-y)-(x-y)
=(x-y)(4x²-1)
=(x-y)(2x+1)(2x-1)
④16x的四次方-8x²y²+y四次方
=(4x²-y²)²
=(2x+y)²(2x-y)²
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=y的(n-1)次方(x²-y²)
=y的(n-1)次方(x+y)(x-y)
⑥-4a²x²+8ax-4
=-4(a²x²-2ax+1)
=-4(ax-1)²
⑦x²-y²-2x+2y
=(x+y)(x-y)-2(x-y)
=(x-y)(x+y-2)
⑧4x²-y²-4x+1
=(4x²-4x+1)-y²
=(2x-1)²-y²
=(2x-1+y)(2x-1-y)
3x²+6xy+3y² 因式分解
dadatou_241年前3
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3x²+6xy+3y²
=3(x²+2xy+y²)
=3(x+y)²
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原式=(x+y)(x-y)/3(x+y)²
=(x-y)/(3x+3y)