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Ta có: \(\frac{1}{7}.\frac{-3}{8}+\frac{1}{7}.\frac{-13}{8}\)
\(=\frac{1}{7}.\left(\frac{-3}{8}+\frac{-13}{8}\right)\)
\(=\frac{1}{7}.\left(-2\right)\)
\(=-\frac{2}{7}\)
a,\(0,5-\frac{5}{41}+\frac{1}{2}-\frac{36}{41}\)
=\(\frac{1}{2}-\frac{5}{41}+\frac{1}{2}-\frac{36}{41}\)
=\(\left(\frac{1}{2}+\frac{1}{2}\right)-\left(\frac{5}{41}+\frac{36}{41}\right)\)
= \(1-1=0\)
b,\(\left(\frac{-1}{3}\right)^2.\frac{4}{11}+\frac{7}{11}.\left(\frac{1}{3}\right)^2\)
=\(\frac{1}{9}.\frac{4}{11}+\frac{7}{11}.\frac{1}{9}\)
=\(\frac{1}{9}\left(\frac{4}{11}+\frac{7}{11}\right)\)
=\(\frac{1}{9}.1=\frac{1}{9}\)
c,\(\left(\frac{-2}{3}+\frac{3}{7}\right):\frac{4}{5}+\left(\frac{-1}{3}+\frac{4}{7}\right):\frac{4}{5}\)
=\(\left(\frac{-2}{3}+\frac{3}{7}-\frac{1}{3}+\frac{4}{7}\right):\frac{4}{5}\)
=\(\left(-1+1\right).\frac{5}{4}=0.\frac{5}{4}\)=0
Cách 1:
A=(3+ 1/2 -2/3 ) -( 2- 2/3 +5/2) - (5- 5/2 + 4/3)
A=17/6-23/6-23/6
A=-29/6
Cách 2:
A=(3+ 1/2 -2/3 ) -( 2- 2/3 +5/2) - (5- 5/2 + 4/3)
A=3+ 1/2 -2/3 - 2+ 2/3 -5/2 - 5+ 5/2 - 4/3
A=-29/6
cách 1:
\(A=\left(3+\frac{1}{2}-\frac{2}{3}\right)-\left(2-\frac{2}{3}+\frac{5}{2}\right)-\left(5-\frac{5}{2}+\frac{4}{3}\right)\)
\(=3+\frac{1}{2}-\frac{2}{3}-2+\frac{2}{3}-\frac{5}{2}-5+\frac{5}{2}-\frac{4}{3}=-4+\frac{1}{2}-\frac{4}{3}\)
\(=\frac{-24}{6}+\frac{3}{6}-\frac{8}{6}=-\frac{29}{6}\)
cách 2:
\(A=\left(3+\frac{1}{2}-\frac{2}{3}\right)-\left(2-\frac{2}{3}+\frac{5}{2}\right)-\left(5-\frac{5}{2}+\frac{4}{3}\right)\)
\(=\left(\frac{18}{6}+\frac{3}{6}-\frac{4}{6}\right)-\left(\frac{12}{6}-\frac{4}{6}+\frac{15}{6}\right)-\left(\frac{30}{6}-\frac{15}{6}+\frac{8}{6}\right)\)
\(=\frac{17}{6}-\frac{23}{6}-\frac{23}{6}=-\frac{29}{6}\)
\(1,\\ a,\Rightarrow x=\dfrac{5\cdot4}{3}=\dfrac{20}{3}\\ b,\Rightarrow x=8\\ c,\Rightarrow x=\dfrac{27\cdot2}{3,6}=15\\ 2,\\ a,\dfrac{6}{9}=\dfrac{42}{63};\dfrac{6}{42}=\dfrac{9}{63};\dfrac{63}{9}=\dfrac{42}{6};\dfrac{63}{42}=\dfrac{9}{6}\\ b,\dfrac{4}{18}=\dfrac{2}{9};\dfrac{4}{2}=\dfrac{18}{9};\dfrac{9}{18}=\dfrac{2}{4};\dfrac{9}{2}=\dfrac{18}{4}\)
1/ Ta có:-12/-37=12/37
ta có:13/38>1/3>12/37
=>13/38>12/37
2/ (-2,5 . 0,38 . 0,4)-[0,125 . 3,15 . (-8)]
=(-2,5 . 0,4 . 0,38)-[0,125 . (-8) . 3,15]
=(-1.0,38)-[-1.3,15]
=-0,38-(-3,15)
=2,77
\(a=4^{16}\cdot5^{25}=\left(2^2\right)^{16}\cdot5^{25}=2^{32}\cdot5^{25}=2^7\cdot\left(2^{25}\cdot5^{25}\right)=2^7\cdot10^{25}=128\cdot10^{25}\)có 28 chữ số
\(10\cdot9\cdot8\cdot7\cdot6\div\left(5+4\cdot3-2\right)+1=2017\)
ghi cách ra xíu bn nhìn hơi rối :v