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Chọn P/S trung gian rồi đi so sánh
Mặc dù mk học rồi nhưng quên mất
Bạn thông cảm nhé
~~~~~ Chúc bạn học tốt ~~~~~~
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\(B=12.10^8+17.10^7+5.10^4+3\)
\(B=12.10^4.10^4+17.10^4.10^3+5.10^4+3\)
\(B=12.10000.10^4+17.1000.10^4+5.10^4+3\)
\(B=120000.10^4+17000.10^4+5.10^4+3\)
\(B=10^4\left(120000+17000+5\right)+3\)
\(B=10^4.137005+3\)
\(B=1370050000+3=1370050003\)
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Bài làm
\(A=\left[\left(\frac{2}{193}-\frac{3}{386}\right).\frac{193}{17}+\frac{33}{34}\right]:\left[\left(\frac{7}{2001}+\frac{11}{4002}\right).\frac{2001}{25}+\frac{9}{2}\right]\)
\(=\left[\frac{1}{386}.\frac{193}{17}+\frac{33}{34}\right]:\left[\frac{25}{4002}.\frac{2001}{25}+\frac{9}{2}\right]\)
\(=\left[\frac{1}{34}+\frac{33}{34}\right]:\left[\frac{1}{2}+\frac{9}{2}\right]\)
\(=\frac{1}{5}\)
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a) \(\frac{7.12^3+2.12^3}{4^6.3^{11}}=\frac{12^3.\left(7+2\right)}{\left(2^2\right)^6.3^{11}}=\frac{\left(2^2.3\right)^3.3^2}{2^{12}.3^{11}}=\frac{2^6.3^5}{2^{12}.3^{11}}=\frac{1}{2^6.3^6}=\frac{1}{6^6}\)
\(\frac{-17.10+17.6}{18.11+18.6}=\frac{17.\left(-10+6\right)}{18.\left(11+6\right)}=\frac{17.\left(-4\right)}{18.17}=\frac{-2}{9}\)
\(\frac{6.7.8.10}{9.12.14.15}=\frac{2.3.7.2^3.2.5}{3^2.3.2^2.2.7.3.5}=\frac{2^5.3.5.7}{2^3.3^4.5.7}=\frac{2^2}{3^3}=\frac{4}{27}\)
phần b viết khó hiểu, phải viết phân số như a đàng hoàng
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1+3+5+7+...+193
= (193+1).97 : 2
= 194.97 .1/2
= 97.(194.1/2)
= 97.97
= 9409
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Ta có : [ ( 2/193 - 3/386 ) * 193/17 + 32/34 ] : [ ( 7/2001 + 11/4002 ) * 2001/25 + 9/2 ] .
=> [ 2/193 * 193/17 - 3/386 * 193/17 + 32/34 ] : [ 7/2001 * 2001/25 + 11/4002 * 2001/25 + 9/2 ] .
=> [ 2/17 - 3/34 + 32/34 ] : [ 7/25 + 11/50 + 9/2 ] .
=> [ 4/34 - 3/34 + 32/34 ] : [ 14/50 + 11/50 + 225/50 ] .
=> 33/34 : 5 .
=> 33/34 * 1/5 .
=> 33/170 .
Tính bằng cách thuận tiện nhất:
\(=\left[\left(\frac{2}{193}\cdot\frac{193}{17}\right)-\left(\frac{3}{386}\cdot\frac{193}{17}\right)+\frac{32}{34}\right]:\left[\left(\frac{7}{2001}\cdot\frac{2001}{25}\right)+\left(\frac{11}{4002}\cdot\frac{2001}{25}\right)+\frac{9}{2}\right]\)
\(=\left[\left(\frac{2}{17}-\frac{3}{17}\right)+\frac{32}{34}\right]:\left[\left(\frac{7}{25}+\frac{11}{50}\right)+\frac{9}{2}\right]\)
\(=\left(-\frac{1}{17}+\frac{32}{34}\right):\left(\frac{1}{2}+\frac{9}{2}\right)\)
\(=\frac{15}{17}+5\)
\(=\frac{100}{17}\)
~ học tốt ~
120 : (193-17.10+7)
= 120 : ( 193 - 170 + 7 )
= 120 : ( 23 + 7 )
= 120 : 16
= 7,5
mk sửa lại chỗ này tí :
= 120 : 16
= 7,5
Sửa :
= 120 : 30
= 4
sorry