Ответ:
4)-Б 12/21=4/7
5)
а)348-y=42
-y=42-348
-y=-306
y=306
б)x+7,19=15,4
x=15,4-7,19
x=8,21
в)7 3/4x=3 1/6
7 3/4=7*4+3=31/4
3 1/6=3*6+1=19/6
31/4x=19/6|*4/31
x=38/93
г)12/17y=1|*17/12
y=17/12
6)(10 2/5-2 2/3:1 1/7)+3,2:0,04
(10 2/5-2 2/3*1/7)+3,2:0,04
10 2/5=10*5+2=52/5
2 2/3=2*3+2=8/3
(52/5-8/3*1/7)+80
(52/5-8/21)+80
1052/105+80
9452/105
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Verified answer
Ответ:
4)-Б 12/21=4/7
5)
а)348-y=42
-y=42-348
-y=-306
y=306
б)x+7,19=15,4
x=15,4-7,19
x=8,21
в)7 3/4x=3 1/6
7 3/4=7*4+3=31/4
3 1/6=3*6+1=19/6
31/4x=19/6|*4/31
x=38/93
г)12/17y=1|*17/12
y=17/12
6)(10 2/5-2 2/3:1 1/7)+3,2:0,04
(10 2/5-2 2/3*1/7)+3,2:0,04
10 2/5=10*5+2=52/5
2 2/3=2*3+2=8/3
(52/5-8/3*1/7)+80
(52/5-8/21)+80
1052/105+80
9452/105