Question

dela ex 13 pina la 17

Answer 1

13) 634 - [(206 * 4 - 618 / 3) / x] * 2 = 222 ==>
634 - (824 - 206) * 2 / x = 222 ==>
634x - 618 * 2 = 222x ==>
412x = 1236 ==>
x = 1236 / 412 = 618 / 206 = 309 / 103 = 3

14) 201 + [(702 + 201) / 3 - (125 + x) * 2] / 7 = 208 ==>
201 + [301 - (250 + 2x)] / 7 = 208 ==>
201 + (301 - 250 - 2x) / 7 = 208 ==>
1407 + 51 - 2x = 1456 ==>
2x = 2 ==>
x = 1

15) 30 + 3 * [85 - (75 - 65) * x + 80] = 375 ==>
30 + 3 *(85 - 75x + 65x + 80) = 375 ==>
30 + 255 - 30x + 240 = 375 ==>
30x = 150 ==> x = 5

16) [40 * (x / 8 - 32) * 450 / 15 - 1990] / 2 = 3805 ==>
40 * (x - 256) / 8 * 30 - 1990 = 7610 ==>
150x - 38400 - 1990 = 7610 ==>
150x = 48000 ==>
x = 320

17) [(840 / x) * 2 + (2800 - 1600) / 100] / 2 = 11 ==>
1680 / x + 12 = 22 ==>
1680 + 12x = 22x ==>
10x = 1860 ==>
x = 186

Daca nu intelegi undeva sau ti se pare ca nu am rezolvat corect, te rog sa ma anunti.