Giải nhanh: 4/14×7+2/9×3.
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1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17+18 = 171 nhé
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17+18. = 171
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Mn ơi cho mình hỏi tick kiểu gì ạ mình mới dùng web này nên ko biết
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a)12+24+35-2-14-25=30
b)1-2+3-4+5-6+7-8+9=5
c)25-12-3+24+36=70
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3/7 + 4/9 + 5/11 + 8/14 + 10/18 + 12/22
= 3/7 + 4/9 + 5/11 + 4/7 + 5/9 + 6/11
= ( 3/7 + 4/7 ) + ( 4/9 + 5/9 ) + ( 5/11 + 6/11 )
= 7/7 +9/9 + 11/11
= 1 + 1 + 1
= 3
tk mk nha , cảm ơn ạ , được ko á ?????????
3/7 + 4/9 + 5/11 + 8/14 + 10/18 + 12/22 = 3
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a: \(\dfrac{12}{7}\cdot\dfrac{3}{4}:\dfrac{3}{14}=\dfrac{36}{28}\cdot\dfrac{14}{3}=\dfrac{9}{7}\cdot\dfrac{14}{3}=\dfrac{9}{3}\cdot\dfrac{14}{7}=3\cdot2=6\)
b: 2+5/2:18
=2+5/36
=72/36+5/36
=77/36
\(\dfrac{12}{7}\times\dfrac{3}{4}:\dfrac{3}{14}\)
\(=\dfrac{12}{7}\times\dfrac{3}{4}\times\dfrac{14}{3}\)
\(=\dfrac{12\times3\times14}{7\times4\times3}\)
\(=\dfrac{3\times4\times7\times2\times3}{3\times4\times7}\)
\(=2\times3\)
\(=6\)
\(2+\dfrac{5}{2}:18\)
\(=2+\dfrac{5}{2}\times\dfrac{1}{18}\)
\(=2+\dfrac{5}{36}\)
\(=\dfrac{72}{36}+\dfrac{5}{36}\)
\(=\dfrac{77}{36}\)
#Toru
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1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9=2+4+6+8+10+12+14+16+18
=(2+8)+(4+6)+10+(12+18)+(14+16)
=10+10+10+30+30
=30+30+30
=30x3
=90
\(\dfrac{4}{14}\times7+\dfrac{2}{9}\times3=\dfrac{4\times7}{2\times7}+\dfrac{2\times3}{3\times3}=2+\dfrac{2}{3}=\dfrac{8}{3}\)
4/14 x 7 + 2/9 x 3
= 28/14 + 6/9
= 2 + 2/3
= 6/3 + 2/3
= 8/3
=