Question

Afla valoarea lui a din egalitatea:

60x90-50x{84-[45-(7xa-9):2]}-10=2440

Answer 1

60×90-50×{45-(7×a-9):2]}-10=2440
60×90-50×(45-3,5a-4,5)-10=2440
60×90-50×(40,5-3,5a)-10=2440
5400-2025-175a-10=2440
3375-175a-10=2440
175a=3375-10-2440
175a=3365-2440
a=925÷175
a=5,5




asa cerd

Answer 2

5400-50*{84-[45-(7a-9):2]}=
2440+10
50*{84-[45-(7a-9):2]}=
5400-2450
84-[45-(7a-9):2]=2950:50
45-(7a-9):2=84-59
(7a-9):2=45-25
7a-9=20*2
7a=40+9
a=49:7
a=7