1.x²+4/3x+______ =(x+____ )² 2. Given (A & # 178; + B & # 178;), # 178; - (A & # 178; + B & # 178;) - 6 = 0, then a & # 178; + B & # 178=____ 3. The equations are solved by formula method and collocation method: 2x & # 178; - 3x = 2, 2x-y & # 178; + 6y-11 = 0, x-2y-1 = 0

1.x²+4/3x+______ =(x+____ )² 2. Given (A & # 178; + B & # 178;), # 178; - (A & # 178; + B & # 178;) - 6 = 0, then a & # 178; + B & # 178=____ 3. The equations are solved by formula method and collocation method: 2x & # 178; - 3x = 2, 2x-y & # 178; + 6y-11 = 0, x-2y-1 = 0

1、4/9 2/3
2、3
3、2x²-3x-2=0
(2x+1)(x-2)=0
∴x=-1/2 x=2