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526 x 637 + 448 335510
---------------------------- = ------------------------ = 1
637 x 527 -189 335510
Hok tốt nhé
# EllyNguyen #
= 526 x 637 + 637 - 189 / 526 x 637 + 448
= 526 x 637 + 448 / 526 x 637 + 448
= 1
Tk mk nha
\(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times526+527-189}{526\times637-189+637}\)
\(=\frac{1+527-189}{1-189+637}\)
\(=\frac{1-189+527}{1-189+637}\)
\(=\frac{527}{449}=\frac{339}{449}\)
~ Hok tốt ~
64x100+50x44
=2200+6400
=8600
1026+2774
=3800
mình làm đúng ko vậy
TL:
= 3800
nhé
K CHO MK NHAAAAAAA
BNNNNNNNNNNNNNNNNNNNNNNNNNN
~~HT~~
\(\frac{2}{3\times5}\times a+\frac{2}{5\times7}\times a+...+\frac{2}{13\times15}\times a=\frac{28}{15}\)
=> \(\left(\frac{2}{3\times5}+\frac{2}{5\times7}+...+\frac{2}{13\times15}\right)\times x=\frac{28}{15}\)
=> \(\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{13}-\frac{1}{15}\right)\times x=\frac{28}{15}\)
=> \(\left(\frac{1}{3}-\frac{1}{15}\right)\times x=\frac{28}{15}\)
=> \(\frac{4}{15}\times x=\frac{28}{15}\)
=> \(x=\frac{28}{15}:\frac{4}{15}\)
-> \(x=7\)
\(\frac{2}{3\times5}\times a+\frac{2}{5\times7}\times a+...+\frac{2}{13\times15}\times a=\frac{28}{15}\)
\(a\times\left(\frac{2}{3\times5}+\frac{2}{5\times7}+...+\frac{2}{13\times15}\right)=\frac{28}{15}\)
\(a\times\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{13}-\frac{1}{15}\right)=\frac{28}{15}\)
\(a\times\left(\frac{1}{3}-\frac{1}{15}\right)=\frac{28}{15}\)
\(a\times\frac{4}{15}=\frac{28}{15}\)
\(a=\frac{28}{15}:\frac{4}{15}\)
\(a=\frac{28}{15}\times\frac{25}{4}\)
\(a=\frac{28}{4}=7\)
#)Giải :
Đặt \(A=\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\)
\(A=\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\)
\(A=\frac{1}{5}-\frac{1}{10}\)
\(A=\frac{1}{10}\)
tìm a
a=2 mũ 41 nhân 5 mũ 38
a = 241 . 538
a) \(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)
\(=\frac{637\times526+637-189}{526\times637+448}\)
\(=\frac{637+526+448}{526\times637+448}\)
\(=1\)
b) \(\frac{64\times50+44\times100}{27\times38+146\times19}\)
\(=\frac{50\times\left(64+44\times2\right)}{19\times\left(27\times2+146\right)}\)
\(=\frac{50\times\left(64+88\right)}{19\times\left(54+146\right)}\)
\(=\frac{50\times152}{19\times200}\)
\(=\frac{152}{19\times4}\)
\(=\frac{38}{19}\)
\(=\frac{2}{1}\)
\(=2\)