26: 13/28
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\(\dfrac{1}{28}\) sẽ là :
\(26x\dfrac{1}{28}:\dfrac{13}{28}=26x\dfrac{1}{28}x\dfrac{28}{13}=2\left(tấn\right)\)
\(\dfrac{1}{28}\) là số tấn là:
\(26:\dfrac{13}{28}:28=2\)(tấn)
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12+12-24+13+13-26+14+14-28
=(12+12+-24)+(13+13-26)+(14+14-28)
=0+0+0
=0
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\(\dfrac{5}{13}\) \(\times\) \(\dfrac{9}{14}\) \(\times\) \(\dfrac{28}{27}\) \(\times\) \(\dfrac{26}{35}\)
= \(\dfrac{5}{13}\) \(\times\) \(\dfrac{9}{14}\) \(\times\) \(\dfrac{14\times2}{9\times3}\) \(\times\) \(\dfrac{13\times2}{5\times7}\)
= \(\dfrac{5\times9\times14\times13}{5\times9\times14\times13}\) \(\times\) \(\dfrac{2\times2}{3\times7}\)
= 1 \(\times\) \(\dfrac{4}{21}\)
= \(\dfrac{4}{21}\)
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bỏ tạm 38/25 ra
=(9/10-11/15) +(13/21-15/28) +(197/4851-199/4950)
=1/6+1/12+1/20+...+1/49*50=2450
=3-2/2x3+4-3/3x4+5-4/4x5+....50-49/49x50
=1/2-1/3+1/3-...-1/50
1/2-1/50=12/25
=38/25+12/25=50/25
=2
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Gấp 13 lên 2 lần rồi thêm 19 | 13 x 2 = 26 26 + 19 = 45 |
Gâp 24 lên 4 lần rồi bớt 47 | 24 x 4 = 96 96 – 47 = 49 |
Giảm 35 đi 7 lần rồi thêm 28 | 35 : 7 = 5 5 + 28 = 33 |
Giảm 48 đi 6 lần rồi bớt 2 | 48 : 6 = 8 8 – 2 = 6 |
bang 56
duyet nha
\(26:\frac{13}{28}=26\cdot\frac{28}{13}=\frac{28}{2}=14\)