a+4-0.5a²=
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a+4-0.5a²=
x²-3x-4y²+6y=
x的四次方加2x+1
x²-3x-4y²+6y=
x的四次方加2x+1
因式分解?
a+4-0.5a²
=-0.5(a²+2a-8)
=-0.5(a-2)(a+4)
x²-3x-4y²+6y
=(x²-4y²)+(6y-3x)
=(x+2y)(x-2y)-3(x-2y)
=(x-2y)(x+2y-3)
X4+2X+1
=(X2)2+2X+1
=(X2)2-1+2X+1+1
=(X2-1)+2(X+1)
=(X2+1)(X+1)(X-1)+2(X+1)
=(X+1)[(X2+1)(X-1)+2]
=(X+1)[X3+X2+X-1+2]
=(X+1)[(X3+X)+(X2+1)]
=(X+1)[X(X2+1)+(X2+1)]
=(X+1)(X+1)(X2+1)
a+4-0.5a²
=-0.5(a²+2a-8)
=-0.5(a-2)(a+4)
x²-3x-4y²+6y
=(x²-4y²)+(6y-3x)
=(x+2y)(x-2y)-3(x-2y)
=(x-2y)(x+2y-3)
X4+2X+1
=(X2)2+2X+1
=(X2)2-1+2X+1+1
=(X2-1)+2(X+1)
=(X2+1)(X+1)(X-1)+2(X+1)
=(X+1)[(X2+1)(X-1)+2]
=(X+1)[X3+X2+X-1+2]
=(X+1)[(X3+X)+(X2+1)]
=(X+1)[X(X2+1)+(X2+1)]
=(X+1)(X+1)(X2+1)
a²×c²-b²×c²=a^4-b^4
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(a²+b²)²-4a²b²化简
|a-4|+(b+1)²=0求5(ab²-2a²b)-(4ab²-2a²
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