120:5*12=24*12=288
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0,85=85/100=17/20
17:17*20=1*20=20
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2,5:5*9=0,5*9=4,5
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40%=40/100=2/5
72:2*5=36*5=180
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4 1/11=45/11
2 19/22=63/22
63/22:45=63/22*1/45=7/22*1/5=7/110
7/110*11=7/10*1=7/10=0,7
12см тобиш 4+4+4 или 1/3 =4 3/3=4+4+4
Ответ:
1/5
Пошаговое объяснение:
(у + 2) · (1 - 13·y) + (5·y – 3) · ( 3 + 5·y) - (2·y +7) · (6·y - 1) = -13
y - 13·y² + 2 - 26·y + 15·y + 25·y² - 9 - 15·y - 12·y² + 2·y - 42·y + 7 +13 = 0
25·y² - 13·y² - 12·y² + y - 26·y + 15·y - 15·y + 2·y - 42·y + 2 - 9 + 7 + 13 =0
-65·y+13=0
65·y = 13
y= 13/65 = 1/5
1.where did you put a new CD?(e)
2what did you buy for linda's birthday?(d)
3how many photos did you downloaded?(f)
4who have designed this bridges lately?(a)
5when did start the exchange program?(b)
6whom children did you help aroun the house ?(c)
Это А
В там ответ 1/30
Так решается 5+6-10/30 это равно 1/30