TÍNH BẰNG CÁCH THUẬN TIỆN NHẤT
2\7 - 3\8 + 11\7 + 1\3 + 1\7 - 5\8
GIẢI CHI TIẾT HỘ MÌNH NHÉ
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1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12
= ( 1 + 12 ) + ( 2 + 11 ) + ( 3 + 10 ) + ( 4 + 9 ) + ( 5 + 8 ) + ( 6 + 7 )
= 13 + 13 + 13 + 13 + 13 + 13
= 13 x 6
= 78
sai thui
9+3+2+1+7+8+5+10+6+4= (9+1)+(2+8)+(3+7)+(4+6)+5=10+10+10+10+5=10.4+5=40+5=45
a; 5\(\dfrac{3}{4}\) : 3 + 2\(\dfrac{1}{4}\).\(\dfrac{1}{3}\) - \(\dfrac{3}{8}\)
= \(\dfrac{23}{4}\) : 3 + \(\dfrac{9}{4}\).\(\dfrac{1}{3}\) - \(\dfrac{3}{8}\)
= \(\dfrac{23}{4}\) x \(\dfrac{1}{3}\) + \(\dfrac{3}{4}\) - \(\dfrac{3}{8}\)
= \(\dfrac{23}{12}\) + \(\dfrac{3}{4}\) - \(\dfrac{3}{8}\)
= \(\dfrac{46}{24}\) + \(\dfrac{18}{24}\) - \(\dfrac{9}{24}\)
= \(\dfrac{64}{24}\) - \(\dfrac{9}{24}\)
= \(\dfrac{55}{24}\)
\(\left(\dfrac{2}{7}+\dfrac{5}{7}\right)+\left(\dfrac{3}{5}+\dfrac{2}{5}\right)+\left(\dfrac{3}{8}+\dfrac{4}{8}+\dfrac{1}{8}\right)+\left(\dfrac{1}{9}+\dfrac{8}{9}\right)=1+1+1+1=4\)
\(\dfrac{5}{12}+\dfrac{8}{12}+\dfrac{7}{12}+\dfrac{4}{12}=\dfrac{5+8+7+4}{12}=\dfrac{24}{12}=2\)
5/7×10/7 - 3/7 x 5/7
=5/7 × (10/7-3/7)
=5/7 x 7/7
=5/7 x 1
= 5/7.
Câu trả lời đó, chỉ cần chép vào thôi.
\(\frac{4}{3}:\frac{5}{4}:\frac{6}{5}:\frac{7}{6}:\frac{8}{7}:\frac{9}{8}\)
=\(\frac{4}{3}\times\frac{4}{5}\times\frac{5}{6}\times\frac{6}{7}\times\frac{7}{8}\times\frac{8}{9}\)
=\(\frac{16}{27}\)
2\7 - 3\8 + 11\7 + 1\3 + 1\7 - 5\8
= ( 2/7 + 11/7+ 1/7 ) + ( -3/8 -5/8 ) + 1/3
= 2+11+1 /7 + ( -3-5)/8 + 1/3
= 14/7 -8/8 +1/3
= 14:7 / 7: 7 - 1 +1/3
= 2 - 1 + 1/3
= 1+1/3
= 4/3
`2/7 - 3/8 + 11/7 + 1/3 + 1/7 - 5/8`
`=(-3/8-5/8) + (2/7 + 11/7 + 1/7) + 1/3`
`=((-3-5)/8) + ((2+11+1)/7) + 1/3`
`=-8/8 + 14/7 + 1/3`
`=-1 + 2 + 1/3`
`=1 + 1/3`
`=3/3+1/3`
`=4/3`