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= 45.(15+1)-17/45.15+28
= 45.15+45-17/45.15+28
= 45.15+28/45.15+28
= 1
Tk mk nha
= 45.(15+1)-17/45.15+28
= 45.15+45-17/45.15+28
= 45.15+28/45.15+28
= 1
a)\(\frac{16.17-5}{16.16+11}=\frac{16.17-16+11}{16.16+11}\)\(=\frac{16.\left(17-1\right)+11}{16.16+11}=\frac{16.16+11}{16.16+11}=1\)
b) \(\frac{45.16-17}{28+45.15}=\frac{45.\left(15+1\right)-17}{28+45.15}\)\(=\frac{45.15+45-17}{28+45.15}=\frac{45.15+28}{28+45.15}=1\)
c) \(\frac{7256.4375-725}{3650+4375.7255}=\frac{\left(7255+1\right).4375-725}{3650+4375.7255}\)\(=\frac{7255.4375+4375-725}{3650+4375.7255}\)\(=\frac{7255.4375+3650}{3650+4375.7255}=1\)
Câu C nhớ sửa 725 thành 7255 nha !
Bài giải
\(a,\text{ }\frac{16\cdot17-5}{16\cdot16+11}=\frac{16\cdot16+16-5}{16\cdot16+11}=\frac{16\cdot16+11}{16\cdot16+11}=1\)
\(b,\text{ }\frac{45\cdot16-17}{28+45\cdot15}=\frac{45\cdot15+45-17}{45\cdot15+28}=\frac{45\cdot15+28}{45\cdot15+28}=1\)
\(c,\text{ }\frac{7256\cdot4375-725}{3650+4375\cdot7255}=\frac{4375\cdot7255+4375-725}{4375\cdot7255+3650}=\frac{4375\cdot7255+3650}{4375\cdot7255+3650}=1\)
Tính:
\(\frac{45\cdot16-17}{45\cdot15+28}\)
\(=\frac{45\cdot15+45-17}{45\cdot15+28}\)
\(=\frac{45\cdot15+28}{45\cdot15+28}=1.\)
Tìm x:
\(5^x+5^{x+2}=650\)
=>\(5^x+5^x\cdot25=650\)
=>\(5^x\cdot26=650\)
Dễ rồi nhá.
Bài 1 : Ta có : \(\frac{45.16-17}{45.15+28}=\frac{45.16-17}{45.15+45-17}=\frac{45.16-17}{45\left(15+1\right)-17}=\frac{45.16-17}{45.16-17}=1\)
Bài 2 :
Ta có 5x + 5x + 2 = 650
=> 5x(1 + 52) = 650
=> 5x . 26 = 650
=> 5x = 650 : 26
=> 5x = 25
=> 5x = 52
=> x = 2
17 x 42 + 67 x 58 - 50 x 28
= 714 + 3886 - 1400
= 4600 - 1400
= 3200
17x42+67x58-50x28
= (42+58) x (67-17)-(50x28)
= 100 x 50 - 1400
= 5000 - 1400
= 3600
ta có: \(1-\frac{17}{20}=\frac{3}{20};1-\frac{22}{25}=\frac{3}{25}\)
\(\Rightarrow\frac{3}{20}>\frac{3}{25}\Rightarrow1-\frac{17}{20}>1-\frac{22}{25}\)
\(\Rightarrow\frac{17}{20}< \frac{22}{25}\)
Lời giải:
$25\frac{2}{13}-(\frac{15}{17}+15\frac{2}{13)$
$=25+\frac{2}{13}-\frac{15}{17}-15-\frac{2}{13}$
$=(25-15)+(\frac{2}{13}-\frac{2}{13})-\frac{15}{17}$
$=10-\frac{15}{17}=\frac{155}{17}$
\(=\frac{45.15+45-17}{45.15+58}=\frac{45.15+28}{45.15+58}=???\)
ủa đề sai à ta?
\(\frac{73.15}{103.15}\)