( 1/12 + 3 1/6 - 30.75 ) . (-4) - ( 3/5 + 4.415 + 1/200 ) :0.001
* Chú ý: 3 1/6 có nghĩa là ba và một phần sáu
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\(\frac{6}{5}-\frac{1}{4}+\frac{4}{5}-\frac{3}{4}\)
\(=\left(\frac{6}{5}+\frac{4}{5}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1\)
\(=1\)
\(\frac{7}{9}-\frac{5}{12}+\frac{2}{9}-\frac{7}{12}\)
\(=\left(\frac{7}{9}+\frac{2}{9}\right)-\left(\frac{5}{12}+\frac{7}{12}\right)\)
\(=1-1\)
\(=0\)
các câu sau tương tự
A=1
B=0
C=ÂM 8/15
D=0
E=2
F=3/2
H=2/3
LẦN SAU CHO KHÓ SÍU NHA LỚP 5 CŨNG LÀM ĐC
\(A=\frac{\left(\frac{3}{5}-\frac{87}{200}+\frac{1}{200}\right):\left(-\frac{1}{25}\right)}{\frac{123}{4}+\frac{1}{12}+\frac{19}{6}}\)
\(A=\frac{\frac{17}{100}:\left(-\frac{1}{25}\right)}{34}\)
\(A=\frac{-\frac{17}{4}}{34}\)
\(A=\frac{-17}{4}.\frac{1}{34}\)
\(A=-\frac{1}{8}\)
Study well
2/3+1/3.(-4/9+5/6):7/12
=2/3+1/3.(-8/18+15/18):7/12
=2/3+1/3.7/18:7/12
=2/3+7/54:7/12
=2/3+7/54.12/7
=2/3+2/9
=6/9+2/9
=8/9
\(\frac{-5}{6}\)+ \((\frac{-6}{11}+1)\)=\(\frac{-5}{6}\)+\((\frac{-6}{11}+\frac{11}{11})\)=\(\frac{-5}{6}\)+\(\frac{5}{11}\)=\(\frac{-55}{66}+\frac{30}{66}\)=\(\frac{-25}{66}\)
1) \(\frac{5}{8}.\frac{7}{3}-\frac{5}{2}.\frac{1}{8}=\frac{5}{8}.\frac{7}{3}-\frac{5}{8}.\frac{1}{2}=\frac{5}{8}\left(\frac{7}{3}-\frac{1}{2}\right)=\frac{5}{8}.\frac{11}{6}=\frac{55}{48}\)
2) \(\frac{21}{10}.\frac{3}{4}-\frac{21}{10}.\frac{3}{4}=\frac{21}{10}\left(\frac{3}{4}-\frac{3}{4}\right)=\frac{21}{10}.0=0\)
3) \(\frac{-4}{11}:\frac{-6}{11}=\frac{-4}{11}.\frac{-11}{6}=\frac{-4.\left(-11\right)}{11.6}=\frac{-4.\left(-1\right)}{1.6}=\frac{4}{6}=\frac{2}{3}\)
4)\(\frac{2}{7}.\frac{14}{3}-1=\frac{2.14}{7.3}-1=\frac{2.2}{1.3}-1=\frac{4}{3}-1=\frac{1}{3}\)
5)\(\frac{4}{7}:\left(\frac{1}{5}.\frac{4}{7}\right)=\frac{4}{7}:\frac{4}{35}=\frac{4}{7}.\frac{35}{4}=\frac{4.35}{7.4}=\frac{1.5}{1.1}=5\)
6) \(\frac{12}{7}.\frac{7}{4}+\frac{35}{11}:\frac{245}{121}=\frac{12.7}{7.4}+\frac{35}{11}.\frac{121}{245}=\frac{3.1}{1.1}+\frac{35}{11}.\frac{121}{245}=3+\frac{35}{11}.\frac{121}{245}=3+\frac{35.121}{11.245}=\frac{1.11}{1.7}=\frac{11}{7}\)
12,7:4 = 3,175 ; 12:6,13 = 1,957585644 ; 9:3,5*4,15 = 10,67142857
12/17 : 4 = 12/17 * 1/4 = 12/68 = 6/34
12 : 6/13 = 12/1 * 13/6 = 156/6 = 26
9 : 3/5 * 4/15 = 9/1 * 5/3 * 4/15 = 15/1 * 4/15 = 60/15 = 4
\(=-4910\)
=-4910