=-65.87+65.17-87.17+65.87=
=17(65-87)=-17.22
=-65.87+65.17-87.17+65.87=
=17(65-87)=-17.22
17-65.(87-17)-87.(17-65)
87-17.(-65)+(-87).(17-65)
-65 . ( 87 -17 ) -87 . ( 17 - 65 )
Tính: -65.(87 - 17) - 87.(17 - 65)
65.(87-17)+87.(17-65)
tính nhanh:
a)-65.(87-17) - 87.(17-65)
b)87.(13-18) - 13.(87+18)
tính nhanh: -65 .(87-17)-87.(17-65)
Tính nhanh
-65.(87-17)-87.(17-65)
Tính
a) ( 135 − 35 ) . ( − 37 ) + 37 ( − 41 − 59 )
b) − 65 ( 87 − 17 ) − 87 ( 17 − 65 )
c) 3 ( − 2 ) − ( − 8 ) . ( − 7 ) − ( − 2 ) . ( − 5 )