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a: \(1\frac{4}{23}+\frac{5}{21}-\frac{4}{23}+0,5+\frac{16}{21}\)
\(=\left(1+\frac{4}{23}-\frac{4}{23}\right)+\left(\frac{5}{21}+\frac{16}{21}\right)+0,5\)
=1+1+0,5
=2,5
b: \(\frac37\cdot19\frac13-\frac37\cdot33\frac13\)
\(=\frac37\left(19+\frac13-33-\frac13\right)\)
\(=-14\cdot\frac37=-6\)
c: \(9\cdot\left(-\frac13\right)^3+\frac13=9\cdot\frac{-1}{27}+\frac13=-\frac13+\frac13=0\)
d: \(15\frac14:\left(-\frac57\right)-25\frac14:\left(-\frac57\right)\)
\(=\left(15+\frac14-25-\frac14\right):\left(-\frac57\right)\)
\(=-10\cdot\left(-\frac75\right)=14\)
Ta có: \(\frac{1}{7}.\frac{-3}{8}+\frac{1}{7}.\frac{-13}{8}\)
\(=\frac{1}{7}.\left(\frac{-3}{8}+\frac{-13}{8}\right)\)
\(=\frac{1}{7}.\left(-2\right)\)
\(=-\frac{2}{7}\)
12-8.\(\left(\frac{3}{2}\right)^3\)=12-8.\(\frac{9}{8}\)=12-9=3
1. Q=165+247+528+125+315
= 100+60+5+200+40+7+500+20+8+100+20+5+300+10+5
= ( 100+200+500+100+300) + ( 60+40+20+20+10 ) +( 5+7+8+5+5 )
= 1200+150+30
=1280
R=1234+5678+8+80
=1000+200+30+4+5000+600+70+8+8+80
= ( 1000+5000) + ( 200+600 ) + (30+70+80) + ( 4+8+8)
=6000+800+180+20
=7000