求几道题的讲解1.若x 2+mx-15=(x+3)(x-5),则m的值为( )2.若a+b=1,则a 2+b 2+2ab的值是( )3.已知(a+b) 2=7,(a-b)2=3,则a+b的值是( )4.x 2+ax+4=(x-2)2,则a等于( 05.若x-y=2,则½ x2-xy+½ y 2=( )6.
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/05 20:58:07
xVNXP8;P@`iV#9oi-iLs+ i)$- |l_u.N# k}ekzT*kwo%o6IqeVd4bg21+#cٷ=Sm/=#3x[jGhM&?߽z#ਤjs2@xbhII$(݈h6*
fIޱw
izю5E_X5ncbFI