Bài 4:Tính
-5/8 : 15/4
-15/17 : 25/-34
-12:8/3
-15/14:20/-21
-48:(-24/5)
-30/7:(-5/-14)
15/28 : (-9/14)
-7/40:(-21/20)
-30/21:(15/-7)
48/-25:(24/-15)
-18/25:(-9/50)
5 1/3:(-8/9)
Các bạn ơi giúp mình vs ạ,mình đang cần gấp !!!!!!!!!
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1+2+3+4+5+6+7+8+9+10=55
11+12+13+14+15+16+17+18+19+20=155
1+2+3+4+5+6+7+8+9+10+11+12+13+14 +15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30-50-53=362
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275
\(1+2+3+4+5+6+7+8+9+10=55\)
\(11+12+13+14+15+16+17+18+19+20=155\)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30 =465
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37
=(1+37)x37:2
=703
\(\dfrac{-5}{8}:\dfrac{15}{4}=\dfrac{-5}{8}\cdot\dfrac{4}{15}=\dfrac{-1\cdot1}{2\cdot3}=\dfrac{-1}{6}\)
\(\dfrac{-15}{17}:\dfrac{25}{-34}=\dfrac{-15}{17}\cdot\dfrac{-34}{25}=\dfrac{-3\cdot-2}{1\cdot5}=\dfrac{-6}{5}\)
\(-12:\dfrac{8}{3}=-12\cdot\dfrac{3}{8}=\dfrac{-12\cdot3}{8}=\dfrac{-3\cdot3}{2}=\dfrac{-9}{2}\)
\(\dfrac{-15}{14}:\dfrac{20}{-21}=\dfrac{-15}{14}\cdot\dfrac{-21}{20}=\dfrac{-3\cdot-3}{2\cdot4}=\dfrac{-9}{8}\)
\(-48:\dfrac{-24}{5}=-48\cdot\dfrac{5}{-24}=\dfrac{-48\cdot5}{-24}=2\cdot5=10\)
\(\dfrac{-30}{7}:\dfrac{-5}{-14}=\dfrac{-30}{7}:\dfrac{5}{14}=\dfrac{-30}{7}\cdot\dfrac{14}{5}=\dfrac{-6\cdot2}{1\cdot1}=-18\)