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\(a,\frac{5}{7}+\frac{7}{13}+\frac{19}{13}+\frac{6}{5}+\frac{9}{7}+\frac{9}{5}.\)
\(=\left(\frac{5}{7}+\frac{9}{7}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{6}{5}+\frac{9}{5}\right)\)
\(=\frac{14}{7}+\frac{26}{13}+\frac{15}{5}=2+2+3=7\)
\(b,\frac{1}{10}+\frac{20}{100}+\frac{300}{1000}+\frac{4000}{10000}\)
\(=\frac{1}{10}+\frac{2}{10}+\frac{3}{10}+\frac{4}{10}=\frac{1+2+3+4}{10}=\frac{10}{10}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
+) 10/20 : 1/6% + 69%
= 10/20 x 6%/1 + 69%
= \(\frac{10}{20}\text{x}\frac{6}{100}+\frac{69}{100}\)
=\(\frac{3}{100}+\frac{69}{100}\)
=\(\frac{72}{100}\)= 0,72
+) \(\frac{20}{2}:100\%\text{x}6:100\text{x}89\%\)
=\(\frac{20}{2}\text{x}6\text{x}89\%:\left(100\%\text{x}100\right)\)
=\(\frac{20}{2}\text{x}6\text{x}\frac{89}{100}:100\)
=\(\frac{20\text{x}6\text{x}89}{2\text{x}100\text{x}100}\)
=\(\frac{3\text{x}89}{5x100}\)
=\(\frac{267}{500}\)
=0.534
ủng hộ mik nhé
\(\frac{10}{20}:\frac{1}{6}\%+69\%=300,69\)
\(\frac{20}{2}:100\%x6:100x89\%=0,534\)
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50 + x = 100
x = 100 - 50
x = 50
x + 50 = 500
x = 500 - 50
x = 450
x - 100 = 300
x = 300 + 100
x = 400
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Phần A hình như sai đầu bài , mình sửa lại và làm luôn nhé :
A = ( 2 + 4 + 6 + 8 .... + 100 ) x ( 142142 x 143 - 143143 x 142 )
A = ( 2 + 4 + 6 + 8 + ... + 100 ) x ( 142 x 1001 x 143 - 143 x 1001 x 142 )
A = ( 2 + 4 + 6 + 8 + .. + 100 ) x 0
A = 0
B = ( 630 - 315 x 2 ) : ( 1 + 2 + 3 + ... + 1000 )
B = ( 630 - 630 ) : ( 1 + 2 + 3 + ... + 100 )
B = 0 : ( 1 + 2 + 3 + ... + 100 )
B = 0
Bài làm
\(\frac{1}{10}+\frac{20}{100}+\frac{300}{1000}+\frac{4000}{10000}\)
\(=\frac{1}{10}+\frac{2}{10}+\frac{3}{10}+\frac{4}{10}\)
\(=\frac{1+2+3+4}{10}\)
\(=\frac{10}{10}\)
\(=1\)
# Học tốt #
\(\frac{1}{10}+\frac{20}{100}+\frac{300}{1000}+\frac{4000}{10000}\)
=\(\frac{1}{10}+\frac{2}{10}+\frac{3}{10}+\frac{4}{10}\)
= \(\frac{1+2+3+4}{10}\)
=\(\frac{10}{10}\)
= 1