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a] 4/12 ; 5/12 ; 11/2 ; 1/4
b] 1 ; 9/12; 12/5 ; 11/3
c] 8/21; 6/11;8/7
d] 2/3 ;2/7 15/2
a]1/3 5/12 11/2 1/4
b]1 3/4 12/5 33/9
c]8/21 6/11 8/7
d]2/3 2/7 15/2
A\(\frac{7}{8}+\frac{7}{12}+\frac{9}{8}+\frac{5}{12}\)
\(=\left(\frac{7}{12}+\frac{5}{12}\right)+\left(\frac{7}{8}+\frac{9}{8}\right)\)
\(=1+2\)
\(=3\)
A\(\frac{7}{8}+\frac{7}{12}+\frac{9}{8}+\frac{5}{12}\)
\(=\left(\frac{7}{8}+\frac{9}{8}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)\)
\(=1+2\)
\(=3\)
B\(\frac{2}{5}\times\frac{4}{7}-\frac{3}{7}\times\frac{2}{5}\)
\(=\left(\frac{4}{7}-\frac{3}{7}\right)\times\frac{2}{5}\)
\(=\frac{1}{7}\times\frac{2}{5}\)
\(=\frac{2}{35}\)
Tính bằng cách thuận tiện nhất
a,5*12*3*7/3*8*7*5
b, 2*5*4*6/4*3*5*7
Làm nhanh nha , mình đang cần gấp
a)
\(\frac{5.12.3.7}{3.8.7.5}=\frac{1.12.1.1}{1.8.1.10}=\frac{12}{8}=\frac{3}{2}\)
b)
\(\frac{2.5.4.6}{4.3.5.7}\frac{2.1.1.2.3}{1.1.1.7}=\frac{12}{7}\)
HOK TỐT!
1, =4/9 x (3/7 + 2 x 4/7) - 1/9 - 3/9
= 4/9 x 1 - 1/9 - 3/9 = 0
2, = ( 22/5 x 5/22 ) x 12
= 1 x 12 = 12
\(\frac{5}{7}.4+\frac{5}{7}+2.\frac{5}{7}+\frac{15}{7}=\frac{5}{7}.4+\frac{5}{7}+2.\frac{5}{7}+3.\frac{5}{7}\)
\(=\frac{5}{7}.\left(4+1+2+3\right)\)
\(=\frac{5}{7}.10=\frac{50}{7}\)
= 5/7 x [ 4 + 2 + 15/7 ]
=5/7 x 57/7
=399/49
- Mình không chắc là đúng đâu.
\(\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}:7+\frac{6}{5}\)
\(=\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}\times\frac{1}{7}+\frac{6}{5}\)
\(=\frac{3}{5}\times\left(\frac{6}{7}+\frac{1}{7}\right)+\frac{6}{5}\)
\(=\frac{3}{5}\times1+\frac{6}{5}\)
\(=\frac{3}{5}+\frac{6}{5}=\frac{9}{5}\)
~ Hok tốt ~
\(\frac{29}{12}:\frac{1}{2}-\frac{5}{12}:\frac{1}{2}-\frac{1}{2}\)
\(=\left(\frac{29}{12}-\frac{5}{12}\right):\frac{1}{2}-\frac{1}{2}\)
\(=2:\frac{1}{2}-\frac{1}{2}\)
\(=4-\frac{1}{2}=\frac{7}{2}\)
~ Hok tốt ~
\(=\dfrac{2}{7}+\dfrac{12}{7}+4\times\dfrac{2}{7}-\dfrac{2}{7}\\ =\dfrac{2}{7}\times\left(1+4-1\right)+\dfrac{12}{7}\\ =\dfrac{2}{7}\times4+\dfrac{12}{7}\\ =\dfrac{8}{7}+\dfrac{12}{7}=\dfrac{12+8}{7}=\dfrac{20}{7}\)