-a^2-2ab-b^2

题目

-a^2-2ab-b^2
9×1.2^2-16×1.4^2
1/2(a-b)a+1/2b·b

答案

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 )是否可以解决您的问...