А) x : 4/25 = 3/4 : 4/5 б) 7 4/5 : 2 3/5 = 4 1/2 : y в) 15.04 : 2.688= m : 26.88 решите

а) x ÷ [latex] \frac{4}{25} [/latex] = [latex] \frac{3}{4} [/latex] ÷ [latex] \frac{4}{5} [/latex] x × [latex] \frac{25}{4} [/latex] = [latex] \frac{3}{4} [/latex] × [latex] \frac{5}{4} [/latex] [latex] \frac{25x}{4} [/latex] = [latex] \frac{15}{16} [/latex] 25x × 16 = 4 × 15 400x = 60;  x = [latex] \frac{60}{400} [/latex] = 0,15 б) [latex]7 \frac{4}{5} [/latex] ÷ [latex]2 \frac{3}{5} [/latex] = [latex]4 \frac{1}{2} [/latex] ÷ y 7,8 ÷ 2,6 = 4,5 × [latex] \frac{1}{y} [/latex] [latex] \frac{3}{1} [/latex] = [latex] \frac{4,5}{y} [/latex] 3 × y = 4,5 × 1 3y = 4,5;  y = [latex] \frac{4,5}{3} [/latex] = [latex] \frac{45}{30} [/latex] = [latex]1 \frac{1}{2} [/latex] = 1,5 3. [latex] \frac{15,04}{2,688} [/latex] = [latex] \frac{m}{26,88} [/latex] 15,04 × 26,88 = 2,688 × m 2,688m = 404,2752;  m = [latex] \frac{404,2752}{2,688} [/latex] = [latex] \frac{404275,2}{2688} [/latex] =  150,4

а) х : 4/25 = 3/4 : 4/5; х * 25/4 = 3/4; 25х/4 = 3; 25х = 3; х = 3/25 = 0,12. б) 74/5 : 23/5 = 41/2 : у; 74/5 * 5/23 = 41/2 * 1/у; 74/23 = 41/2у; 148у = 943; у = 943/148 ≈ 6,4. в) 15,04 : 2,688 = m : 26,88; m = (15,04 * 26,88)/2,688 = 150,4