问题
填空题
配方:x2-3x+______=(x-______)2;
2y2+4y-3=2(y+______)2-5.
答案
x2-3x+
=(x-9 4
));3 2
2y2+4y-3=2(y2+2y)-3=2[(y2+2y+1)-1]-3=2(y+1)2-5.
配方:x2-3x+______=(x-______)2;
2y2+4y-3=2(y+______)2-5.
x2-3x+
=(x-9 4
));3 2
2y2+4y-3=2(y2+2y)-3=2[(y2+2y+1)-1]-3=2(y+1)2-5.