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A. (121 + 44) × 11 = 121 × 11 + 44 ×11
B. (180 – 84) × 12 = 180 × 12 – 84 × 12
C. 1235 × (125 + 5) = 1235 × 125 – 1235 × 5
D. 2460 × (12 - 5) = 2460 × 12 – 2460 × 5 |
Câu B là câu trả lời đúng Chúc bạn học tốt( •̀ ω •́ )✧
a) 197148:84=2347
101598:287=354
b)9/20-8/5x5/12= -13/60
2/3:4/5:7/12=10/7
4/9+11/8-5/6=71/72
tính :
a) 197148:84=2347
101598:287=354
b)9/20-8/5x5/12= -13/60
2/3:4/5:7/12=10/7
=4/9+11/8-5/6=71/72
=9/4x2/3+16/9x4/3
=18/12+64/36
=54/36+64/36=118/36=59/18
`12/19xx19/18+11/15:11/5`
`=2/3+11/15xx5/11`
`=2/3+1/3`
`=3/3`
`=1`
\(\dfrac{7}{6}\) + \(\dfrac{5}{12}\) - \(\dfrac{1}{18}\) - 1
= \(\dfrac{42}{36}\) + \(\dfrac{15}{36}\) - \(\dfrac{2}{36}\) - \(\dfrac{36}{36}\)
= \(\dfrac{19}{36}\)
\(\dfrac{13}{6}\) + \(\dfrac{5}{18}+3-\dfrac{7}{12}\)
= \(\dfrac{78}{36}+\dfrac{10}{36}+\dfrac{108}{36}-\dfrac{21}{36}\)
= \(\dfrac{175}{36}\)
3 + \(\dfrac{11}{4}-\dfrac{1}{12}-\dfrac{3}{16}\)
= \(\dfrac{144}{48}+\dfrac{132}{48}-\dfrac{4}{48}-\dfrac{9}{48}\)
= \(\dfrac{263}{48}\)
\(\dfrac{2}{5}\) x \(\dfrac{7}{4}\) - \(\dfrac{2}{5}\) x \(\dfrac{3}{4}\)
= \(\dfrac{2}{5}\) x ( \(\dfrac{7}{4}\) - \(\dfrac{3}{4}\))
= \(\dfrac{2}{5}\) x \(\dfrac{4}{4}\)
= \(\dfrac{2}{5}\)
\(\dfrac{18}{84}\) : \(\dfrac{11}{12}\)
= \(\dfrac{3}{14}\) \(\times\) \(\dfrac{12}{11}\)
= \(\dfrac{18}{77}\)