问题
填空题
x2+6x+______=(x+______)2,x2-3x+
|
答案
∵6x=2×3•x,
∴x2+6x+9=(x+3)2,
x2-3x+
=(x-9 4
)2.1 2
故应填:9,3;(x-
)2.3 2
x2+6x+______=(x+______)2,x2-3x+
|
∵6x=2×3•x,
∴x2+6x+9=(x+3)2,
x2-3x+
=(x-9 4
)2.1 2
故应填:9,3;(x-
)2.3 2