Toán Lớp 6: Tính Nhanh
(37-17)•(-5)+23-(-13-17)
b. (-57)•(67-34)-67•(34-57)
Giúp mik vs ạ
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Toán Lớp 6: Tính Nhanh
(37-17)•(-5)+23-(-13-17)
b. (-57)•(67-34)-67•(34-57)
Giúp mik vs ạ
Comments ( 2 )
(37–17).(–5)+23.(–13–17)
=20.(–5)+23.(–30)
=(–100)+(–690)
=(–790)
b)
(-57).(67-34)-67.(34-57)
=67.(-57)+34.57-67.34+67.57
=34.(57-67)
=34.(-10)
=(-340)