Jest dobrze bo robiłam to na lekcji a) 9+x = 1 7/8 x= 1 7/8 - 9 x = - 7 1/8 l) Odpowiedź : m= -10
a) 9 + x = [latex]1frac{7}{8} [/latex] x = [latex]frac{15}{8} [/latex] - 9 /×8 8x = 15 - 72 8x = -57 / ÷8 x = [latex] -frac{57}{8} [/latex] b) -8y = 5 / ÷(-8) y = [latex]- frac{5}{8} [/latex] c) x - [latex] frac{4}{5} [/latex] = 0,8 x = 0,8 + [latex] frac{4}{5} [/latex] = [latex] frac{8}{5} [/latex] g) 8a +4 = 36 8a = 32 a = 4 h) [latex] frac{8}{9} k[/latex] + [latex] frac{1}{3} [/latex] = 3 [latex] frac{8}{9} k[/latex] = 3 - [latex] frac{1}{3} [/latex] [latex] frac{8}{9} k[/latex] = [latex] frac{8}{3} k[/latex] k = [latex] frac{72}{24} k[/latex] = 3 i) 6b - 3 = 9 6b = 12 b = 2 j) [latex] - frac{3}{4} [/latex] - [latex] frac{1}{4} l[/latex] = 2,25 - [latex] frac{1}{4} l[/latex] = 2,25 + [latex] frac{3}{4} [/latex] - [latex] frac{1}{4} l[/latex] = 3 / ×(- [latex] frac{1}{4} [/latex]) l = [latex] -frac{3}{4}[/latex] k) -2,5c - 8 = 17 -2,5c = 25 c = -10 l) 0,4m - 2 = -6 0,4m = -4 m = -10 Pozdrawiam i polecam :)