It's cool.It's good time to climb hills.中的it和to的不定式个在句中做什么成分?

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• It's cool.It's good time to climb hills.中的it和to的不定式个在句中做什么成分?
• It's cool.It's good time to climb hills.中的it和to的不定式个在句中做什么成分?
• It's a good time to climb hills.(同义句）It's a good time ____ _____ hills.
• can you help me thank you very much .已知▲ABC的三条边为a、b、c、,方程x²+2(a+c-b)x+2ac-b²=0有两个相 等 的实数根.（1）求证：▲ABC是等边三角形；（2）若方程2x²+2k(a+c)x+2ack²+5k-6=0有两个不相等的实数根,求k的取值范围.