(5/9х-1/4)*5/4=5/4
5/9х-1/4=5/4:5/4
5/9х-1/4=1
5/9х=1+1/4
5/9х=1 1/4
х=1 1/4:5/9
х=9/4=2 1/4
121×64/77×24=11×11×4×2×4×2/11×7×2×3×4=11×4×2/7×3=88/21
Удачи!
<span>48* (-3)= -144
Ответ:-144</span>
21 : 3/7 = 21 * 7/3 = 7* 7 = 49
============================
420 : 0,7 = 600
============================
17\% = 0,17
68 : 0,17 = 400