计算题:
(1)|−23|÷|+32|=49
49
;
(2)(+5)+(-7)=______;
(3)(13−12)×12=______;
(4)7a2b+2a2b=______;
(5)3xy2-7xy2=______;
(6)x-[3x-2(1+2x)]=______;
(7)-{-[-(2x-3y)]}=______.
(8)(−2)÷[(−12)2×(12)3]×|−254|−(−5)
(9)−12008+(1−0.5)×13×[2−(−3)3]
(10)−13×23−0.34×321+13×(−13)−323×0.34
(11)0.29+[(2.5)2−(−2324)]÷(−6)−(−0.71)
(12)-32-(-3)2+(-3)2×(-325)-(0.3)2÷|-0.9|
(13)-32×(-13)2+(324-328+329)×(-24)