100 : 2 = 50 - доп.множ. к 3/2 = (3*50)/(2*50) = 150/100
100 : 4 = 25 - доп.множ. к 5/4 = (5*25)/(4*25) = 125/100
100 : 5 = 20 - доп.множ. к 6/5 = (6*20)/(5*20) = 120/100
100 : 25 = 4 - доп.множ. к 31/25 = (31*4)/(25*4) = 124/100
60 : 5 = 12 - доп.множ. к 2/5 = (2*12)/(5*12) = 24/60
60 : 12 = 5 - доп.множ. к 5/12 = (5*5)/(12*5) = 25/60
60 : 15 = 4- доп.множ. к 7/15 = (7*4)/(15*4) = 28/60
60 : 30 = 2 - доп.множ. к 13/30 = (13*2)/(30*2) = 26/60
Среднее арифметическое равно сумме чисел, деленной на их количество:
(34,5+32,7+<span>30,9</span>)/3=98,1/3=32,7
<span>0=0</span>
<span><span>10−10</span>=<span>15−15</span></span>
<span><span><span>10−6</span>−4</span>=<span><span>15−9</span>−6</span></span>
<span><span>2<span>(<span><span>5−3</span>−2</span>)</span></span>=<span>3<span>(<span><span>5−3</span>−2</span>)</span></span></span>
<span>2=3</span>
<span><span>2+2</span>=<span>3+2</span></span>
<span><span>2+2</span>=<span>5</span></span>
1 5/6+1 3/4=11/6+7/4=44/24+42/24=86/24
86/24=3 7/12
3 7/12-2/5=3 35/60-24/60=3 11/60
3 11/60= 3ч 11 мин
Ответ:3ч 11мин потратил ученик за всю работу
или
1 5/6=1ч 50мин
1 3/4=1ч 45мин
2/5=24мин
1ч 50м+1ч 45м-24м=3ч 11мин