1 5/7 *3/4 10/11:1 1/3 3.57*4.1+2.43*4.1 3.42:0.57*8.4-6.8
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19 tháng 4 2018
3,42 : 0,57 x 8,4 - 6,8
=6 x 8,4 - 6,8
=50,4 - 6,8
43,6
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21 tháng 5 2021
Câu 1:
\(\dfrac{2}{5}-\dfrac{1}{4}+\dfrac{3}{10}=\dfrac{8}{20}-\dfrac{5}{20}+\dfrac{6}{20}=\dfrac{8-5+6}{20}=\dfrac{9}{20}\)
Câu 2:
\(\dfrac{-2}{5}:\left(1-\dfrac{1}{10}\right)=\dfrac{-2}{5}:\dfrac{9}{10}=\dfrac{-2}{5}.\dfrac{10}{9}=\dfrac{-2.10}{5.9}=\dfrac{-20}{45}=\dfrac{-4}{9}\)
Câu 3:
\(\dfrac{7}{8}.\dfrac{4}{9}+\dfrac{1}{14}:\dfrac{5}{14}=\dfrac{7}{18}+\dfrac{1}{5}=\dfrac{53}{90}\)
Câu 4:
\(\dfrac{2}{7}.\dfrac{3}{11}+\dfrac{2}{7}.\dfrac{8}{11}\)
\(=\dfrac{2}{7}.\left(\dfrac{3}{11}+\dfrac{8}{11}\right)\)
\(=\dfrac{2}{7}.1\)
\(=\dfrac{2}{7}\)
S
21 tháng 5 2021
Câu 1
\(\dfrac{2}{5}\)-\(\dfrac{1}{4}\)+\(\dfrac{3}{10}\)= \(\dfrac{8}{20}\)-\(\dfrac{5}{20}\)+\(\dfrac{6}{20}\)=\(\dfrac{3}{20}\)+\(\dfrac{6}{20}\)=\(\dfrac{9}{20}\)
Câu 2
-\(\dfrac{2}{5}\):(1-\(\dfrac{1}{10}\))= -\(\dfrac{2}{5}\):\(\dfrac{9}{10}\)=-\(\dfrac{2}{5}\).\(\dfrac{10}{9}\)=-\(\dfrac{4}{9}\)
Câu 3
\(\dfrac{7}{8}.\dfrac{4}{9}+\dfrac{1}{14}:\dfrac{5}{14}\)= \(\dfrac{7}{8}.\dfrac{4}{9}+\dfrac{1}{14}.\dfrac{14}{5}\)=\(\dfrac{7.4}{4.2.9}+\dfrac{1.14}{14.5}\)=\(\dfrac{7}{18}+\dfrac{1}{5}\)=\(\dfrac{35}{90}+\dfrac{18}{90}\)=\(\dfrac{53}{90}\)
Câu 4
\(\dfrac{2}{7}.\dfrac{3}{11}+\dfrac{2}{7}.\dfrac{8}{11}\)=\(\dfrac{2}{7}.\left(\dfrac{3}{11}+\dfrac{8}{11}\right)\)=\(\dfrac{2}{7}.1\)=\(\dfrac{2}{7}\)
\(1\frac{5}{7}\cdot\frac{3}{4}=\frac{12}{7}\cdot\frac{3}{4}=\frac{9}{7}\)
\(\frac{10}{11}:1\frac{1}{3}=\frac{10}{11}:\frac{4}{3}=\frac{15}{22}\)
\(3,57\cdot4,1+2,43\cdot4,1=(3,57+2,43)\cdot4,1\)
\(=6\cdot4,1=24,6\)
Cuối tự làm
~Chúc bn học tốt~
\(1\frac{5}{7}x\frac{3}{4}=\frac{12}{7}x\frac{3}{4}=\frac{9}{7}\)
\(\frac{10}{11}:1\frac{1}{3}=\frac{10}{11}:\frac{4}{3}=\frac{10}{11}x\frac{3}{4}=\frac{30}{44}=\frac{15}{22}\)
\(3,57x4,1+2,43x4,1=4,1x\left(3,57+2,43\right)=4,1x6=24,6\)
\(3,42:0,57x8,4-6,8=6x8,4-6,8=50,4-6,8=43,6\)