\(A=2,53\times17+17,67\times15+2,53\times83+17,67\times85\)
\(A=2,53\times17+2,53\times83+17,67\times15+17,67\times85\)
\(A=2,53\times\left(17+83\right)+17,67\times\left(15+85\right)\)
\(A=2,53\times100+17,67\times100\)
\(A=253+1767\)
\(A=2020\)
Phùng Bảo Kha:
y: 10 + y \(\times\) 3,9 = 4,8
y \(\times\) 0,1 + y \(\times\)3,9 = 4,8
y \(\times\)(0,1 + 3,9) = 4,8
y \(\times\) 4 = 4,8
y = 4,8 : 4
y = 1,2