Toán Lớp 6: Tính nhanh a) (−2020) − [(−2020) + 137] b) 1000 − 131 − 69 c) (−500) − 141 + 141 d) (−235) + 53 + 47 e) (−157) − (13 − 57) f) (−45) − 5

Question

Toán Lớp 6:  Tính nhanh a) (−2020) − [(−2020) + 137] b) 1000 − 131 − 69 c) (−500) − 141 + 141 d) (−235) + 53 + 47 e) (−157) − (13 − 57) f) (−45) − 5 − (−32) + 18

tonhu12 · Answer

a)   (-2020) - [ (-2020) + 137]   =  -2020 + 2020 - 137   =  0 - 137    = -137   b)   1000 - 131  - 69    = 1000 - (131 + 69)    = 1000 - 200    = 800   c)   (-500) - 141 + 141   =  -500 + (141-141)   = -500+0    = -500   d)   (-235) + 53 + 47   = (-235) + (53+47)   =  -235 + 100   =  -135   e)   (-157) - (13 - 57)   =  -157 - 13 + 57   =  (-157+57)-13   = -100 - 13   = -113   f)   (-45) - 5 - (-32) + 18    = -45 - 5 + 32 + 18   =  (-45-5) + (32+18)   =  -50 + 50    =0

ngocle44 · Answer

a, (-2020) - [(-2020 + 137]   = -2020 + 2020 - 137   = 0 - 137   = -137   b, 1000 - 131 - 69   = 1000 - (131 + 69)   = 1000 - 200   = 800   c, (-500) - 141 + 141   = -500 - (141 - 141)   = -500 - 0   = -500   d, (-235) + 53 + 47   = -235 + (53 + 47)   = -235 + 100   = -135   e, (-157) - (13 - 57)   = -157 - 13 + 57   = (-157 + 57) - 13   = -100 - 13   = -113   f, (-45) - 5 - (-32) + 18   = -45 - 5 + 32 + 18   = (-45 - 5) + (32 + 18)   = -50 + 50   = 0