6/7+12/5:8/7 giải hộ mình voi
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a)5/12 - 15/8 : 9 = 5/12 - 5/24 = 10/24 -5/24 = 5/24
b)35/13 - 2 + 6 x 7/6 = 35/13 - 2 + 7 = 100/13
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=43/12-16/6.(20/32+7/32)
=43/12-16/6.27/32
=43/12-9/4
=43/12-27/12
=4/3
43/12-16/6x[5/8+7/32]
=43/12-16/6x[20/32+7/32]
=43/12-16/6x27/32
=43/12-432/192
=688/192-432-192
=256/192=4/3
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\(\left(-\dfrac{7}{12}+\dfrac{5}{8}\right)-\left(-\dfrac{3}{8}+\dfrac{5}{12}\right)\)
\(=-\dfrac{7}{12}+\dfrac{5}{8}-\left(-\dfrac{3}{8}\right)-\dfrac{5}{12}\)
\(=\left(-\dfrac{7}{12}-\dfrac{5}{12}\right)+\left(\dfrac{5}{8}+\dfrac{3}{8}\right)\)
\(=-1+1=0\)
\(\left(-\dfrac{7}{12}+\dfrac{5}{8}\right)-\left(-\dfrac{3}{8}+\dfrac{5}{12}\right)\)
\(=-\dfrac{7}{12}+\dfrac{5}{8}+\dfrac{3}{8}-\dfrac{5}{12}\)
\(=\left(-\dfrac{7}{12}-\dfrac{5}{12}\right)+\left(\dfrac{5}{8}+\dfrac{3}{8}\right)\)
\(=-\dfrac{12}{12}+\dfrac{8}{8}\)
\(=-1+1\)
\(=0\)
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tính
( 3/8+-3/4+7/12):5/6+1/2
=(-3/8+7/12):5/6+1/2
=5/24:5/6+1/2
=1/4+1/2
=3/4
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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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\(\dfrac{7}{5}+\dfrac{4}{7}-\dfrac{9}{10}=\dfrac{49-20}{35}-\dfrac{9}{10}=\dfrac{19}{35}-\dfrac{9}{10}=\dfrac{190-315}{350}=\dfrac{-125}{350}\)
\(\dfrac{2}{1}+\dfrac{3}{4}\text{×}\dfrac{8}{5}=\dfrac{8+3}{4}\text{×}\dfrac{8}{5}=\dfrac{11\text{×}8}{4\text{×}5}=\dfrac{88}{20}\)
mấy câu kia áp dụng là dc!
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\(\dfrac{6}{7}+\dfrac{12}{5}:\dfrac{8}{7}\)
\(=\dfrac{6}{7}+\dfrac{12}{5}\times\dfrac{7}{8}\)
\(=\dfrac{6}{7}+\dfrac{84}{40}\)
\(=\dfrac{240}{280}+\dfrac{588}{280}\)
\(=\dfrac{828}{280}\)
12/5chia8/7 bằng 12/5 x 7/8 bằng 96/35 6/7+96/35 bằng 126/35