48/54=72/87-x
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\(\Rightarrow\)
\(\text{Ta có :}\)
\(\frac{35\cdot48\cdot47}{25\cdot54\cdot72}=\frac{7\cdot5\cdot6\cdot8\cdot47}{5\cdot5\cdot9\cdot6\cdot8\cdot7}=\frac{47}{5\cdot9}=\frac{47}{45}\)
\(\text{Chúc bạn học tốt !}\)
\(\left(-48\right).54+\left(-48\right).46+480\)
\(=\left(-48\right).\left(54+46\right)+480\)
\(=\left(-48\right).100+480\)
\(=-4800+480\)
\(=-4320\)
_________
\(900:\left[50+\left(7^2-8.3\right).2\right]+2022^0\)
\(=900:\left[50+\left(49-24\right).2\right]+1\)
\(=900:\left[50+25.2\right]+1\)
\(=900:\left[50+50\right]+1\)
\(=900:100+1\)
\(=9+1=10\)
a) \(\left(145\times99+145\right)-\left(143\times102-143\right)\)
\(=\left[145\times\left(99+1\right)\right]-\left[143\times\left(102-1\right)\right]\)
\(=\left(145\times100\right)-\left(143\times101\right)\)
\(=14500-14443\)
\(=57\)
b) \(54\times47-47\times53-20-27\)
\(=47\times\left(54-53\right)-20-27\)
\(=47-20-27\)
\(=0\)
c) \(10000-47\times72-47\times28\)
\(=10000-47\times\left(72+28\right)\)
\(=10000-47\times100\)
\(=10000-4700\)
\(=5300\)
d) \(3457-27\times48-48\times73+6543\)
\(=\left(3457+6543\right)-48\times\left(27+73\right)\)
\(=10000-48\times100\)
\(=10000-4800\)
\(=5200\)
UCLN(54,42,48)=6;UCLN(24,36,72)=12
UCLN(180,168)=12;UCLN(48,72)=24
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