因式分解 1.5x²+6xy-8y² 2.70xy²-3by-10bxy+21y² 3.a^5+a²-a³-1 4.6a&s
因式分解1.5x²+6xy-8y²2.70xy²-3by-10bxy+21y²3.a^5+a²-a³-14.6...
因式分解 1.5x²+6xy-8y² 2.70xy²-3by-10bxy+21y² 3.a^5+a²-a³-1 4.6a²-11ab+3b²
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1.5x²+6xy-8y²=(5x-4y)(x+2y)
2.70xy²-3by-10bxy+21y²
=7y^2(10x+3)-by(3+10x)
=(7y^2-by)(10x+3)
=y(7y-b)(10x+3)
3.a^5+a²-a³-1=a^3(a^2-1)+(a^2-1)
=(a^3+1)(a^2-1)
=(a+1)(a^2-a+1)(a-1)(a+1)
=(a+1)^2(a-1)(a^2-a+1)
4.6a²-11ab+3b²=(3a-b)(2a-3b)
2.70xy²-3by-10bxy+21y²
=7y^2(10x+3)-by(3+10x)
=(7y^2-by)(10x+3)
=y(7y-b)(10x+3)
3.a^5+a²-a³-1=a^3(a^2-1)+(a^2-1)
=(a^3+1)(a^2-1)
=(a+1)(a^2-a+1)(a-1)(a+1)
=(a+1)^2(a-1)(a^2-a+1)
4.6a²-11ab+3b²=(3a-b)(2a-3b)
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