Ответ:
Пошаговое объяснение:
7:1.4=5+3/5=5+0.6=5.6*2=11.2+0.8=12
9-3.8=5.2+4/5=5.2+0.8=6:4=1.5+3.5=5
5:4=1.25+3/4=1.25+0.75=2*3.5=7-2.8=4.2
6:4=1.5+2 1/2=1.5+2.5=4*0.8=3.2-1.2=2
3. С
-2 5/6 * 3 1/3= - 17/6 * 10/3= - 85/9= - 9 4/9
4. А
...=4/22 х - 1 13/22 х - 5/18 у +15/18 у= - 1 9/22 ч+10/18 у= - 1 9/22 х +5/9 у
Х+3х-10=150
4х-10=150
4х=150+10
4х=160
х=40
Ответ:
(12 2/3+0,7-12,7):0,05 = 37/60
1) 12 2/3 + 0,7= 12 2/3 + 7/10 = 12 20/30+21/30= 12 41/30 = 13 11/30
2) 13 11/30 - 12,7= 13 11/30 - 12 7/10 = 13 11/30 - 12 21/30 = 12 41/30 - 12 21/30= 20/30=2/3
3)2/3:0,05= 2/3: 5/100= 200/300:15/300=185/300= 37/60