Question

calculează. 17+9*3+2*(27-5*5)-3*(42-7*5)​

Answer 1

$17 + 27 + 2 \times 2 - 3 \times 7 \\ 17 + 27 + 4 - 21 \\ 44 + 4 - 21 \\ 48 - 21 = 27$

Answer 2

17+9*3+2*(27-5*5)-3*(42-7*5)
=17+27+2(27-25)-3(42-35)
=17+27+2*2-3*7
=17+27+4-21
=27