脱式计算,能简算的要简算(1)17.42-5. 87+2.58-4.13(2)6.28×(0.75+6.28)(3)68÷ [0.5×(7.5-7)](4)(-×)÷(5)
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-.
计算: (1); (2).