Question

初一数学分解因式

3(x+1)-(x+1)^2

3(x-y)-2(x-y)^2

5m(a+b)-a-b
过程

Answer 1

3( x + 1 ) - ( x + 1 )"
= ( x + 1 )( 3 - x - 1 )
= ( x + 1 )( 2 - x )

3( x - y ) - 2( x - y )"
= ( x - y )( 3 - 2x + 2y )

5m( a + b ) - a - b
= 5m( a + b ) - ( a + b )
= ( a + b )( 5m - 1 )

Answer 2

①=（X+1)(2-X)
②=（X-Y)(3-2X+2Y)
③=(a+b)(5m-1)