几道简单的算式啊(2y-3x)²=(2分之1x-5分之3y)的平方=(2a-b)²=(m+3n)²=(x-3)²=
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几道简单的算式啊(2y-3x)²=(2分之1x-5分之3y)的平方=(2a-b)²=(m+3n)²=(x-3)²=
几道简单的算式啊
(2y-3x)²=
(2分之1x-5分之3y)的平方=
(2a-b)²=
(m+3n)²=
(x-3)²=
几道简单的算式啊(2y-3x)²=(2分之1x-5分之3y)的平方=(2a-b)²=(m+3n)²=(x-3)²=
(2y-3x)²=4y²-12xy+9x²
(2分之1x-5分之3y)的平方=4分之1x²-5分之3xy+25分之9y²
(2a-b)²=4a²-4ab+bN
(m+3n)²=m²+6mn+9n²
(x-3)²=x²-6x+9
是要展开吗?
1.4y方+9x方-12xy
2.1/4x方+9/25y方-3/5xy
3.4a方+b方-4ab
4.m方+9n方+6mn
5.x方+9-6x