初二上册的数学题,麻烦要有步骤,谢谢!解方程X(9X-5)-(3X+1)(3X-1)=5(X-1)(X-3)+25=(X+2)(X+4)1.(-X)³(-Y)²-(-X³Y²)2.-9A²B³C²÷(-3AB)²化简求值(2X-Y
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![初二上册的数学题,麻烦要有步骤,谢谢!解方程X(9X-5)-(3X+1)(3X-1)=5(X-1)(X-3)+25=(X+2)(X+4)1.(-X)³(-Y)²-(-X³Y²)2.-9A²B³C²÷(-3AB)²化简求值(2X-Y](/uploads/image/z/10855220-68-0.jpg?t=%E5%88%9D%E4%BA%8C%E4%B8%8A%E5%86%8C%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%98%2C%E9%BA%BB%E7%83%A6%E8%A6%81%E6%9C%89%E6%AD%A5%E9%AA%A4%2C%E8%B0%A2%E8%B0%A2%21%E8%A7%A3%E6%96%B9%E7%A8%8BX%EF%BC%889X-5%EF%BC%89-%EF%BC%883X%2B1%EF%BC%89%EF%BC%883X-1%EF%BC%89%3D5%EF%BC%88X-1%EF%BC%89%EF%BC%88X-3%EF%BC%89%2B25%3D%EF%BC%88X%2B2%EF%BC%89%EF%BC%88X%2B4%EF%BC%891.%EF%BC%88-X%EF%BC%89%26%23179%3B%EF%BC%88-Y%EF%BC%89%26%23178%3B-%EF%BC%88-X%26%23179%3BY%26%23178%3B%EF%BC%892.-9A%26%23178%3BB%26%23179%3BC%26%23178%3B%C3%B7%EF%BC%88-3AB%EF%BC%89%26%23178%3B%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%882X-Y)
初二上册的数学题,麻烦要有步骤,谢谢!解方程X(9X-5)-(3X+1)(3X-1)=5(X-1)(X-3)+25=(X+2)(X+4)1.(-X)³(-Y)²-(-X³Y²)2.-9A²B³C²÷(-3AB)²化简求值(2X-Y
初二上册的数学题,麻烦要有步骤,谢谢!
解方程
X(9X-5)-(3X+1)(3X-1)=5
(X-1)(X-3)+25=(X+2)(X+4)
1.(-X)³(-Y)²-(-X³Y²)
2.-9A²B³C²÷(-3AB)²
化简求值
(2X-Y)(Y+2X)-(2Y+X)(-2Y-X)
其中X=1 Y=2
(A-2B+C)²
3AB-4BC+1
=3AB-( )
X²-A²+4A-4
=X²-( )
(2/3)²º¹³(-1 1/2)的2014次方
当X=1 Y=1/5时,当3X(2X+Y)-2X(X-Y)的值
已知A+B=6. AB=-27
求A²+B²
和(A-B)²的值
初二上册的数学题,麻烦要有步骤,谢谢!解方程X(9X-5)-(3X+1)(3X-1)=5(X-1)(X-3)+25=(X+2)(X+4)1.(-X)³(-Y)²-(-X³Y²)2.-9A²B³C²÷(-3AB)²化简求值(2X-Y
解方程
X(9X-5)-(3X+1)(3X-1)=5
9x^2-5x-9x^2+1=5
5x=-4
x=-4/5
(X-1)(X-3)+25=(X+2)(X+4)
x^2-4x+28=x^2+6x+8
10x=20
x=2
1.(-X)³(-Y)²-(-X³Y²)
=-x^3y^2-(-x^3y^2)
=0
2.-9A²B³C²÷(-3AB)²
=.-9A²B³C²÷9A²B²
=-BC^2
化简求值
(2X-Y)(Y+2X)-(2Y+X)(-2Y-X)其中X=1 Y=2
=4x^2-y^2+(2y+x)^2
=4x^2-y^2+4y^2+4xy+x^2
=5x^2+4xy+3y^2 X=1 Y=2
= 5+40+12
=57
(A-2B+C)²=[(A+C)-2B]^2=(A+C)^2-4B(A+C)+4B^2=A^2+2AC+C^2-4AB-4BC+4B^2
3AB-4BC+1=3AB-( 4BC-1 )
X²-A²+4A-4=X²-( A^2-4A+4)=x^2-(A-2)^2=(x-A+2)(x+A-2)
(2/3)²º¹³(-1 - 1/2)的2014次方
=(2/3)²º¹³*(3/2)^2014
=(2/3)²º¹³*(3/2)^2013*(3/2)
=[(2/3)*(3/2)]^2013*(3/2)
=3/2
当X=1 Y=1/5时,当3X(2X+Y)-2X(X-Y)的值
3X(2X+Y)-2X(X-Y)
=6x^2+3xy-2x^2+2xy
=4x^2+5xy
=x(4x+5y) X=1 Y=1/5
=1*(4+1)
=5
已知A+B=6. AB=-27
求
A²+B²=(A+B)^2-2AB=36-2*(-27)=36+54=90
(A-B)²
=A^2+B^2-2AB
=90-2*(-27)
=90+54
=144