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\(a.\frac{7}{5}+\frac{4}{7}-\frac{9}{10}=\frac{98}{70}+\frac{40}{70}-\frac{63}{70}=\frac{98+40-63}{70}=\frac{75}{70}\)\(=\frac{15}{14}\)
\(b.2+\frac{3}{4}x\frac{8}{5}=2+\frac{6}{5}=\frac{16}{5}\)
\(c.\frac{9}{8}-\frac{6}{5}:\frac{8}{5}=\frac{9}{8}-\frac{6}{5}x\frac{5}{8}=\frac{9}{8}-\frac{6}{8}=\frac{3}{8}\)
a)\(\frac{-3}{5}+\frac{1}{4}+\frac{-3}{10}\)
\(=\frac{-12}{20}+\frac{5}{20}+\frac{-6}{20}\)
\(=\frac{-13}{20}\)
b)\(\frac{1}{5}+\frac{-9}{10}+\frac{-7}{25}=\frac{10}{50}+\frac{-45}{50}+\frac{-14}{50}=\frac{-49}{50}\)
c)\(\frac{1}{5}+\frac{-1}{6}+\frac{1}{7}+\frac{-1}{8}+\frac{1}{9}+\frac{1}{8}+\frac{-1}{7}+\frac{1}{6}+\frac{-1}{5}\)
=\(\left(\frac{1}{5}+\frac{-1}{5}\right)+\left(\frac{-1}{6}+\frac{1}{6}\right)+\left(\frac{1}{7}+\frac{-1}{7}\right)+\left(\frac{1}{8}+\frac{-1}{8}\right)+\frac{1}{9}\)
=\(0+0+0+0+\frac{1}{9}\)
=\(\frac{1}{9}\)
\(\left(1+1+1\right)!=6\)
\(2+2+2=6\)
\(3\times3-3=6\)
\(\sqrt[]{4}+\sqrt{4}+\sqrt[]{4}=6\)
\(5+\left(5\div5\right)=6\)
\(6\times6\div6=6\)
\(7-\left(7\div7\right)=6\)
\(\sqrt{\left(8\div8\right)+8}!=6\)
\(\left(9-9\right)+\sqrt{9}!=6\)
\(\sqrt{10-\left(10\div10\right)}!=6\)
\(\left(9-9\right)+\sqrt{9}!=6\)
15,8:5+24,6:5=(15,8+24,6):5=8,08
34,2:10-28,9:10=(34,2-28,9):10=0,53
15 ,8 : 5 + 24 ,6 : 5
= (15,8 + 24,6) :5
= 40,4 : 5
= 8,08
34 ,2 : 10 - 28 ,9 : 10
= (34,2 + 28 ,9) : 10
= 63,1 : 10
= 6,31
\(3\div\frac{1}{2}=3\times\frac{2}{1}=6\)
\(\frac{1}{2}\div3=\frac{1}{2}\times\frac{1}{3}=\frac{1}{6}\)
2.Tính theo mẫu :
b) \(\frac{6}{25}\div\frac{21}{20}=\frac{6}{25}\times\frac{20}{21}=\frac{6\times20}{25\times21}=\frac{2\times3\times4\times5}{5\times5\times3\times7}=\frac{8}{35}\)
\(\frac{40}{7}\times\frac{14}{5}=\frac{40\times14}{7\times5}=\frac{5\times8\times7\times2}{7\times5}=16\)
\(\frac{17}{13}\div\frac{51}{26}=\frac{17}{13}\times\frac{26}{51}=\frac{17\times13\times2}{13\times17\times3}=\frac{2}{3}\)
Chúc bạn hok tốt !
a)=(3/8+10/16)+(7/12+10/24)
=1+1=2
c)=(4/6+14/6)+(7/13+19/13)+(17/9+1/9)
=3+2+2=7
\(\frac{9}{10}\)x\(\frac{5}{6}\)=\(\frac{45}{60}\)=\(\frac{45}{10}\)câu này thì mk thấy nó sao sao ấy!
a) \(\frac{4}{3}\)x\(\frac{9}{10}\)=\(\frac{12}{10}\)
mk rút gọn tất cả lun nha!!
b) \(\frac{9}{26}\):\(\frac{27}{8}\)=\(\frac{18}{39}\)
c) \(\frac{40}{7}\):\(\frac{5}{14}\)=16
