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a) (2 × 3 × 8)/(4 × 5 × 6 × 7)
= (6 × 2 × 4)/(4 × 5 × 6 × 7)
= 2/(5 × 7)
= 2/35
b) (36 × 22 × 51)/(11 × 17 × 72)
= (36 × 2 × 11 × 3 × 17)/(11 × 17 × 2 × 36)
= 3
Lời giải:
a.
\(\frac{2\times 3\times 8}{4\times 5\times 6\times 7}=\frac{2\times 24}{24\times 5\times 7}=\frac{2}{5\times 7}=\frac{2}{35}\)
b.
\(\frac{36\times 22\times 51}{11\times 17\times 72}=\frac{36\times 2\times 11\times 17\times 3}{11\times 17\times 72}=\frac{72\times 11\times 17\times 3}{11\times 17\times 72}=3\)
a) \(\dfrac{2}{3}+\dfrac{4}{5}=\dfrac{10}{15}+\dfrac{12}{15}=\dfrac{22}{15}\)
b) \(\dfrac{5}{6}-\dfrac{3}{4}=\dfrac{20}{24}-\dfrac{18}{24}=\dfrac{2}{24}=\dfrac{1}{12}\)
\(\left(\dfrac{1}{6}+4\right)\times\dfrac{3}{10}=\left(\dfrac{1}{6}+\dfrac{24}{6}\right)=\dfrac{25}{6}\times\dfrac{3}{10}=\dfrac{5}{4}\)
\(\left(\dfrac{1}{8}-\dfrac{1}{9}\right)\times\dfrac{3}{2}=\left(\dfrac{9}{72}-\dfrac{8}{72}\right)\times\dfrac{3}{2}=\dfrac{1}{72}\times\dfrac{3}{2}=\dfrac{1}{48}\)
a: =4/12+3/12+10/12=17/12
b: =15/24+6/24+14/24=34/24=17/12
8507cm2
32m^2 217dm^2=320217
3/5 giờ 12 phút = 48 phút
\(\dfrac{3}{7}.\left(\dfrac{5-1}{4}\right)=\dfrac{3}{7}.1=\dfrac{3}{7}\)
\(\dfrac{11}{10}-\dfrac{6}{10}=\dfrac{5}{10}=\dfrac{1}{2}\)
A .12 x 15 x 17 = 3060
6 x 34 x 45 = 9280
B . 11 x 12 x 13 = 1716
6 x 22 x 39 = 5148