Explicație pas cu pas:
[tex]m - 236 \times 3 = 292 \\ m - 708 = 292 \\ m = 292 + 708 \\ m = 1000[/tex]
[tex]332 \times 3 - m = 599 \\ 996 - m = 599 \\ 996 - 599 = m \\ m = 397[/tex]
[tex]m + 118 \times 6 = 900 \\ m + 708 = 900 \\ m = 900 - 708 \\ m = 192[/tex]
[tex]436 \times 2 - m = 297 \\ 872 - m = 297 \\ 872 - 297 = m \\ m = 575[/tex]
[tex]900 + 2 - a \times 100 = 302 \\ 902 - a \times 100= 302 \\ 902 - 302 = a \times 100 \\ 600 = a \times 100 \\ a = 600 \div 100 \\ a = 6[/tex]
[tex]a \times (57 - 13 \times 4) = 40 \\ a \times (57 - 52)= 40 \\ a \times 5 = 40 \\ a= 40 \div 5 \\ a = 8[/tex]
[tex](m \times 2 - 40) \div 23 = 12 \\ m \times 2 - 40 = 12 \times 23 \\ m \times 2 - 40 = 276 \\ m \times 2 = 276 + 40 \\ m \times 2 = 316 \\ m = 316 \div 2 \\ m = 158[/tex]
[tex](m - 416 \div 4 + 2) \times 5 = 1980 \\ m - 104 + 2 = 1980 \div 5 \\m - 102 = 396 \\ m = 396 + 102 \\ m = 498[/tex]
[tex](795 \div 5 - 154) \times m = 715\\ (159 - 154) \times m = 715 \\ 5\times m = 715 \\ m = 715 \div 5 \\ m = 143[/tex]
[tex](808 - a) \times 2 = 418 \\ 808 - a = 418 \div 2 \\ 808 - a = 209 \\ 808 - 209 = a \\ a = 599[/tex]
[tex](777 - a) - 258 = 220 \\ 777 - a = 220 + 258 \\ 777 - a = 478 \\ 777 - 478 = a \\ a = 299[/tex]
[tex](9191 - a) + 687 = 2000 \\ 9191 - a = 2000 - 687 \\ 9191 - a = 1313 \\ 9191 - 1313 = a \\ a = 7878[/tex]
[tex]a + 30 \times 9 = 500 \\ a + 270 = 500 \\ a = 500 - 270 \\ a = 230[/tex]
[tex](36 \div a + 63 \div 9) \div 2 = 8 \\ 36 \div a + 7 = 8 \times 2 \\ 36 \div a = 16 - 7 \\ 36 \div a = 9 \\ a = 36 \div 9 \\ a = 4[/tex]
[tex]6 \times a - 6 = 30 - 2 \times 3 \\ 6 \times a - 6 = 30 - 6 \\ 6 \times a = 24 + 6 \\ 6 \times a = 30 \\ a = 30 \div 6 \\ a = 5[/tex]
[tex]n - (558 \div 9 + 30 \times 15) = 142 \\ n - (62 + 450) = 142 \\ n - 512= 142 \\ n = 142 + 512 \\ n = 654[/tex]
[tex]924 - (150 + a) = 100 + 2 \times 100 \\ 924 - 150 - a = 100 + 200 \\ 774 - a = 300 \\ 774 - 300 = a \\ a = 474[/tex]
