Toán Lớp 5: 4/ tìm y
25,5 + y – 12,5 = 4 x 7
76,22 – y – 25,7 = 30 + 5,52
4,5 – y + 1,2 = 3,5
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Toán Lớp 5: 4/ tìm y
25,5 + y – 12,5 = 4 x 7
76,22 – y – 25,7 = 30 + 5,52
4,5 – y + 1,2 = 3,5
Comments ( 2 )
$⇒25,5 + y – 12,5=28$
$⇒25,5+y=28+12,5$
$⇒25,5+y=40,5$
$⇒y=40,5-25,5$
$⇒y=15$.
$\text{Vậy y = 15}$
$76,22 – y – 25,7= 30+5,52$
$⇒76,22 – y – 25,7=35,52$
$⇒76,22 – y=35,52+25,7$
$⇒76,22 – y=61,22$
$⇒y=76,22-61,22$
$⇒y=15$.
$\text{Vậy y = 15}$
$4,5 – y + 1,2= 3,5$
$⇒4,5 – y=3,5-1,2$
$⇒4,5 – y=2.3$
$⇒y=4,5-2,3$
$⇒y=2.2$.
$\text{Vậy y = 2,2}$
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