Question

Salut!
3 x {10 + 2 x [40 - 2 x (28 - 3 x 5)]} - 7x = 51
Cat mai rapid va rog!

Answer 1

Răspuns:

3×(10+2×(40-2×(28-15))-7×=51

3×(10+2×(40-2×13))-7x=51

3×(10+2×(40-26))-7x=51

3×(10+2×14)-7x=51

3×(10+28)-7=51

3×38-7=51

114-7x=51

-7x=51-114

-7×=-63

x=9

Answer 2

Răspuns: x = 9

Explicație pas cu pas:

3 · {10 + 2 · [40 - 2 · (28 - 3 · 5)]} - 7x = 51

3 · {10 + 2 · [40 - 2 · (28 - 15)]} - 7x = 51

3 · [10 + 2 · (40 - 2 · 13)] - 7x = 51

3 · [10 + 2 · (40 - 26)] - 7x = 51

3 · (10 + 2 · 14) - 7x = 51

3 · (10 + 28) - 7x = 51

3 · 38 - 7x = 51

114 - 7x = 51

114 = 51 + 7x

7x = 114 - 51

7x = 63

x = 63 : 7

x = 9

==pav38==