Question

Repede.Ex.7.Dau coroana

Answer 1

$a) \\ \\ a : 6 = 72 \times 9=648 \\ \\ a=648:6=108 \\ \\ b) \\ \\ 300 - (2 \times a + 57) = 131 \\ \\ 2 \times a + 57 = 300 - 131 = 169 \\ \\ 2 \times a = 169 - 57 = 112 \\ \\ a = 112 : 2 = 56 \\ \\ c) \\ \\ a : 8 : 5 = 5 \\ \\a : 8 = 25 \\ \\ a = 25 \times 8 = 200 \\ \\ d) \\ \\ (a \times 4 + 51) - 203 = 20 \\ \\ a \times 4 + 51 - 203 = 20 \\ \\ 4a + 51 - 203 = 20 \\ \\ 4a - 152 = 20 \\ \\ 4a = 20 + 152 = 172 \\ \\ a = 172 : 4 = 43 \\ \\ e) \\ \\ a : 2 + 43 - (200 - 56) : 6 = 35 \\ \\ a : 2 + 43 - (200 - 56) = 210 \\ \\ a : 2 + 43 - 144 = 210 \\ \\ a : 2 + 143 = 354 \\ \\ a : 2 = 311 \\ \\ a = 311 \times 3 = 622$