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a, 315-x=327-264
<=> 315-x=63
<=> x=315-63
<=>x=252
b, 147-x=10 x 5
<=> 147-x=50
<=> x= 147-50
<=> x=97
\(\left(315-x\right)+264=327\)
\(\left(315-x\right)=63\)
\(x=315-63\)
\(x=252\)
\(\left(147-x\right):5=10\)
\(\left(147-x\right)=50\)
\(x=147-50\)
\(x=97\)
\(=\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+...+\dfrac{1}{145}-\dfrac{1}{147}\)
\(=\dfrac{1}{5}-\dfrac{1}{147}=\dfrac{142}{735}\)
Kết quả phép tính trên là:
57 x 76 + 147 - 43 x 71 = 1426
Đáp số: 1426
a: x/147=5/7
=>x=147*5/7=105
b: x-2/36=7/12
=>x-2/36=21/36
=>x=21/36+2/36=23/36
\(147-7.\left(x-13\right)=98\)
\(7\left(x-13\right)=147-98\)
\(7\left(x-13\right)=49\)
\(x-13=49:7\)
\(x-13=7\)
\(x=7+13\)
\(x=20\)
\(\frac{\frac{1}{2\times4}+\frac{1}{4\times6}+\frac{1}{6\times8}+...+\frac{1}{98\times100}}{y}=\frac{147}{50}\)
\(\frac{\frac{1}{2}\times\left(\frac{2}{2\times4}+\frac{2}{4\times6}+\frac{2}{6\times8}+...+\frac{2}{98\times100}\right)}{y}=\frac{147}{50}\)
\(\frac{\frac{1}{2}\times\left(\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{6}+\frac{1}{6}-\frac{1}{8}+...+\frac{1}{98}-\frac{1}{100}\right)}{y}=\frac{147}{50}\)
\(\frac{\frac{1}{2}\times\left(\frac{1}{2}-\frac{1}{100}\right)}{y}=\frac{147}{50}\)
\(\frac{\frac{1}{2}\times\frac{49}{100}}{y}=\frac{147}{50}\)
\(\frac{49}{200}:y=\frac{147}{50}\)
\(y=\frac{49}{200}:\frac{147}{50}\)
\(y=\frac{1}{12}\)
147 x 91 x 147 x 909
= ( 147 x 91 ) x ( 147 x 909 )
= 13377 x 133623
= 1787474871
2016 x 419 - 2016 x 329
= ( 419 - 329 ) x 2016
= 100 x 2016
= 201600
147 x 91 x 147 x 909
= 13377 x 133623
= 1787474871
2016 x 429 - 2016 x 329
= 2016 x ( 429 - 329 )
= 2016 x 100
= 201600