Question

( 100 ori d- 110):39=10 d este necunoscuta

Answer 1

$(100\times d-110):39=10|\cdot 39 \Rightarrow 100\times d - 110 = 390 \Rightarrow \\ \Rightarrow 100\times d = 500 \Rightarrow d = 500:100 \Rightarrow d = 5$

Answer 2

(100×d-110)=10×39
(100×d-110)=390
(100×d)=390+110
(100×d)=500
d=500÷100
d=5