2+2+2+2 = ? mn chỉ mik nha !
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\(\dfrac{a}{b}:\dfrac{1}{2}+\dfrac{2}{7}=5\)
\(\Leftrightarrow\)\(\dfrac{a}{b}:\dfrac{1}{2}=5-\dfrac{2}{7}\)
\(\Leftrightarrow\)\(\dfrac{a}{b}:\dfrac{1}{2}=\dfrac{33}{7}\)
\(\Leftrightarrow\)\(\dfrac{a}{b}=\dfrac{33}{7}.\dfrac{1}{2}\)
\(\Leftrightarrow\)\(\dfrac{a}{b}=\dfrac{33}{14}\)
\(Vậy a=33 , b=14\)
Giải:
\(\dfrac{a}{b}:\dfrac{1}{2}+\dfrac{2}{7}=5\)
\(\Rightarrow\) \(\dfrac{a}{b}:\dfrac{1}{2}=5-\dfrac{2}{7}\)
\(\Rightarrow\) \(\dfrac{a}{b}:\dfrac{1}{2}=\dfrac{33}{7}\)
\(\Rightarrow\) \(\dfrac{a}{b}=\dfrac{33}{7}.\dfrac{1}{2}\)
\(\Rightarrow\) \(\dfrac{a}{b}=\dfrac{33}{14}\)
Vậy a = 33, b = 14
Bài 2:
Chu vi hình chữ nhật:
\(\left(4\dfrac{3}{7}+2\dfrac{1}{5}\right).2=\left(\dfrac{31}{7}+\dfrac{11}{5}\right).2=\dfrac{232}{35}.2=\dfrac{464}{35}\left(m\right)\)
Diện tích hình chữ nhật:
\(4\dfrac{3}{7}.2\dfrac{1}{5}=\dfrac{31}{7}.\dfrac{11}{5}=\dfrac{341}{35}\left(m^2\right)\)
32. Tom is strong so he can lift that heavy table
33. Nam's father used to drink a lot of wine
34. We have been in Sapa for 2 years
35. l don't mind to help you repair the radio
36.He climbed a tree in order to get a better view
37. Did Jame Watt invent the steam engine?
38. This is the first time she has seen a more unusal festival than this
39. An important experiment is being carry out by the scientists
40. Cheese is made from milk
CHÚC EM HỌC TỐT NHÁ
\(=2.34\left(2+2\cdot2+3\cdot2-2\right)=2.34\cdot10=23.4\)
Câu 2 : x :248 =1000 - 862
X : 248 = 138
X = 138 x 248
X = 34224
\(\dfrac{x}{10}\) : \(\dfrac{3}{4}\) = \(\dfrac{4}{6}\)
\(\dfrac{x}{10}\) = \(\dfrac{4}{6}\) x \(\dfrac{3}{4}\)
\(\dfrac{x}{10}\) = \(\dfrac{1}{2}\)
x = \(\dfrac{1}{2}\) x 10
x = 5
Câu b):
( 26 x 16 ) - ( 6020 : 35 )
= 416 - 172
= 244
Câu 2:
a). Tìm x:
1. x : 248 = 1000 - 862
x : 248 = 138
x = 138 x 248
x = 34 224
2. \(\dfrac{x}{10}:\dfrac{3}{4}=\dfrac{4}{6}\)
\(\dfrac{x}{10}=\dfrac{4}{6}\) x \(\dfrac{3}{4}\)
\(\dfrac{x}{10}=\dfrac{1}{2}\)
\(x=\dfrac{1}{2}\) x \(10\)
\(x=5\)
Bằng 8 nhé, HT
8 NHÉ
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