,初二数学题(分式,分解因式,通分)分解因式①(a²-b²)+(3a-3b)②(x²+y²)²-4x²y²②9(m+n)²-(m-n)²③3ax²+6axy+3ay²④x(x+4)+4⑤6a(b-a)²-2(a-b)
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,初二数学题(分式,分解因式,通分)分解因式①(a²-b²)+(3a-3b)②(x²+y²)²-4x²y²②9(m+n)²-(m-n)²③3ax²+6axy+3ay²④x(x+4)+4⑤6a(b-a)²-2(a-b)
,初二数学题(分式,分解因式,通分)
分解因式①(a²-b²)+(3a-3b)
②(x²+y²)²-4x²y²
②9(m+n)²-(m-n)²
③3ax²+6axy+3ay²
④x(x+4)+4
⑤6a(b-a)²-2(a-b)³
十字相乘
①x²-7x+6
②x²+3x+2
③x²-4x-21
④x²+2x-15
⑤a²-4a+4-b²
⑥x²-y²-z²-2yz
通分
①2x分之y,3y²分之x,4xy分之1
②x+3分之1,x-3分之1
③a²-4分之1,a-2分之1
④x-y分之5,(y-x)²分之3
,初二数学题(分式,分解因式,通分)分解因式①(a²-b²)+(3a-3b)②(x²+y²)²-4x²y²②9(m+n)²-(m-n)²③3ax²+6axy+3ay²④x(x+4)+4⑤6a(b-a)²-2(a-b)
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分解因式
①(a²-b²)+(3a-3b)
=(a+b)(a-b)+3(a-b)
=(a-b)(a+b-3)
②(x²+y²)²-4x²y²
=(x²+2xy+y²)(x²-2xy+y²)
=(x+y)²(x-y)²
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分解因式
①(a²-b²)+(3a-3b)
=(a+b)(a-b)+3(a-b)
=(a-b)(a+b-3)
②(x²+y²)²-4x²y²
=(x²+2xy+y²)(x²-2xy+y²)
=(x+y)²(x-y)²
②9(m+n)²-(m-n)²
=[3(m+n)+(m-n)][3(m+n)-(m-n)]
=(4m+2n)(2m+4n)
=4(2m+n)(m+2n)
③3ax²+6axy+3ay²
=3a(x²+2xy+y²)
=3a(x+y)²
④x(x+4)+4
=x²+4x+4
=(x+2)²
⑤6a(b-a)²-2(a-b)³
=6a(a-b)²-2(a-b)³
=2(a-b)²[3a-(a-b)]
=2(a-b)²(2a+b)
还有两大题,请再分成二个提问吧。
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分解因式
①(a²-b²)+(3a-3b)
=(a+b)(a-b)+3(a-b)
=(a-b)(a+b-3)
②(x²+y²)²-4x²y²
=(x²+2xy+y²)(x²-2xy+y²)
=(x+y)²(x-y)²
全部展开
分解因式
①(a²-b²)+(3a-3b)
=(a+b)(a-b)+3(a-b)
=(a-b)(a+b-3)
②(x²+y²)²-4x²y²
=(x²+2xy+y²)(x²-2xy+y²)
=(x+y)²(x-y)²
②9(m+n)²-(m-n)²
=[3(m+n)+(m-n)][3(m+n)-(m-n)]
=(4m+2n)(2m+4n)
=4(2m+n)(m+2n)
③3ax²+6axy+3ay²
=3a(x²+2xy+y²)
=3a(x+y)²
④x(x+4)+4
=x²+4x+4
=(x+2)²
⑤6a(b-a)²-2(a-b)³
=6a(a-b)²-2(a-b)³
=2(a-b)²[3a-(a-b)]
=2(a-b)²(2a+b)
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