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a) \(\frac{7}{13}x\frac{7}{15}-\frac{5}{12}x\frac{21}{39}+\frac{49}{91}x\frac{8}{15}=\frac{7}{13}x\frac{7}{15}-\frac{5}{12}x\frac{7}{13}+\frac{7}{13}x\frac{8}{15}\)
\(=\frac{7}{13}x\left(\frac{7}{15}-\frac{5}{12}+\frac{8}{15}\right)=\frac{7}{13}x\left(1-\frac{5}{12}\right)=\frac{7}{13}x\frac{7}{12}=\frac{49}{156}\)
b) \(\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)x\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)=\left(\frac{12}{199}+\frac{23}{200}-\frac{34}{201}\right)x0=0\)
Bài 2:
a) \(0,5+\left(x-\frac{15}{2}\right):\frac{1}{2}=\frac{9}{2}\)
\(\left(x-\frac{15}{2}\right):\frac{1}{2}=4\)
\(x-\frac{15}{2}=2\)
x = 19/2
b) \(2012\times x-2010\times x=2014\)
\(x\times\left(2012-2010\right)=2014\)
\(x\times2=2014\)
x = 1007
c) ( x + 1) + (x+2) + (x+3)+...+(x+100) = 5750
\(x\times100+\left(1+2+3+...+100\right)=5750\)
\(x\times100+5050=5750\)
\(x\times100=700\)
x = 7
12 7/100<12m7cm
đồng nghĩa vs hòa bình : yên tĩnh, tĩnh lặng, yên bình
Đặt câu: Bức tranh quê tôi thật là yên bình và tĩnh lặng
\(\frac{2}{3}=\frac{36}{54}\)
\(\frac{4}{7}=\frac{28}{49}\)
\(\frac{48}{100}=\frac{12}{25}\)
\(\frac{45}{81}=\frac{5}{9}\)
1 + 2 + 3 + 4 + 5 + 6 +7 + 8 + 9 +10 + 11 + 12 + 13 +14 + 15 + 16 + 17 + 18 + 19 = 190
\((1999x1998+1998x1997)x(1+\frac{1}{2}\)\(:1\frac{1}{2}\)\(-1\frac{1}{3}\)\()\)
= \((1999x1998+1998x1997)x\)\((1+\frac{1}{2}\)\(:\frac{3}{2}\)\(-\frac{4}{3}\)\()\)
= \((1999x1998+1998x1997)x\)\((1+\frac{1}{3}\)\(-\frac{4}{3}\)\()\)
= \((1999x1998+1998x1997)x\)\((\frac{4}{3}-\frac{4}{3}\)\()\)
=\((1999x1998+1998x1997)x\)0
= 0
Chúc bạn học tốt!
Ta có:
\((1999x1998+1998x1997)x(1+\frac{1}{2}:1\frac{1}{2}-1\frac{1}{3})\)
\(=(1999x1998+1998x1997)x\left(1+\frac{1}{2}:\frac{3}{2}-\frac{4}{3}\right)\)
\(=\left(1999x1998+1998x1997\right)x\left(1+\frac{1}{3}-\frac{4}{3}\right)\)
\(=\left(1999x1998+1998x1997\right)x\left(\frac{4}{3}-\frac{4}{3}\right)\)
\(=\left(1999x1998+1998x1997\right)x0=0\)
a) = 36 , 34
b)= 56
\(=\left(\frac{5}{12}+\frac{7}{12}\right)+\frac{3}{2014}=\frac{12}{12}+\frac{3}{2014}\)= \(1+\frac{3}{2014}=\frac{3}{2014}\)
\hk tốt
Trả lời :
a) = 36,34
b) = 56
\(=\left(\frac{5}{12}+\frac{7}{12}\right)+\frac{3}{2014}=\frac{12}{12}+\frac{3}{2014}=1+\frac{3}{2014}=\frac{3}{2014}\)