28 * у * 5 = 140у
6а * 8 = 48а
4а * 8в* 3с = 96авс
6а + 8а = 14а
4х + 13х + 15х = 32х
67z - 18z + 37 = 49z + 37
(1.75·2/5+1.75:1)·<span>1 5/7 = 4.2
1) </span>1.75·2/5 = 1.75·0.4 = 0.7
2) <span>1.75:1 = 1.75
</span>3) 0.7 + 1.75 = 2.45
4) 2.45 ·1 5/7 = 245/100 · 12/7 = 49/20· 12/7 = 21/5 = 4 1/5 = 4.2
(17/40-0,325):1/5·<span>0,4 = 0.1
</span>1) 17/40-0,325 = 17/40-3/8 = 17/40-15/40 = 2/40 = 1/20 = 0.05
2) 1/20 :1/5 = 5/20 = 1/4 = 0.25
3) 1/4·0,4 = 1/4·2/5 = 1/10 = 0.1
20*5 получаем 100, 800:100 получаем 8 и к 30 +8=38