Question

Tính hợp lí

1. -55 . 78 + 13 . (-78) - 78 . (-65)

2. -124 + (-52) . 124 .(-47)

Answer 1

1, -55 . 78 + ( -13 ) . 78 - 78 . ( -65 )

   = 78 . ( -55 - 13 - 65 )

   = 78 . ( -133 )

   = -10374

 

Còn lại tự làm

Answer 2

\(1,-55.78+13\cdot\left(-78\right)-78.\left(-65\right)=78\left(-55-13-65\right)=78.\)

Answer 3

1.(−55).78+13.(−78)−78.(−65)=(−55).78+(−13).78−78.(−65)=78.(−55−13+65)=78.(−3)=−2342.−124+(−52).124.(−47)=(−1).124+124.2444=124.(2441−1)=124.2443=303056