计算与分解因式:(1)计算:(x﹣2)(x+2)﹣(x﹣1)2(2)因式分解:a(x﹣y)﹣b(y﹣x)+c(x﹣y)
计算: (1)-(-2)2+ (2)|
计算:
计算题: (1)24+(-14)+(-16)+8 (2) (3) (4)
计算 (1)-9+12-3+8 (2)(-1)+(-)+(+)-(+) (3)(-3)÷2÷(-3)×(-0.75) (4)-16-(1-0.5)××[2-(-3)2]
计算:-12+(π-3.14)0+(-)-2-.