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\(\frac{11}{3}:\frac{99}{21}-\frac{5}{18}\)
\(=\frac{11}{3}.\frac{21}{99}-\frac{5}{18}=\frac{7}{9}-\frac{5}{18}=\frac{14}{18}-\frac{5}{18}\)
\(=\frac{9}{18}=\frac{1}{2}\)
\(\frac{4}{5}+\frac{16}{5}:\frac{4}{55}\)
\(=\frac{4}{5}+\frac{16}{5}.\frac{55}{4}=\frac{4}{5}+11=\frac{4}{5}+\frac{55}{5}\)
\(=\frac{59}{5}\)
11/3:99/21-5/18 =11/3*21/99-5/18=7/9-5/18=15/18-5/18=10/18=5/9 4/5+16/5:4/55=4/5+16/5*55/4=4/5+44=4/5+220/5=224/5 26:13/17:34/7=26*17/13*34/7=34:34/7 =7
a,17/23 + (1 - 17/23)
= 17/23 + 6/23
= 23/23 = 1
b,17/12 + 9/7 - (2/7 + 5 /12)
= (17/12 - 5/12) + (9/7 + 2/7)
= 1+1 = 2
c, 7/13 - ( 4/7 -6/13 )
= 7/13 - 4/7+ 6/13
= (7/13 + 6/13) -4/7
= 13/13 -4/7
= 1 -4/7 = 3/7
hok tốt✍️ ✍️
a) 17/23+(1-17/23)
=17/23+1-17/23
=1
b)17/12+9/7-(2/7+5/12)
=17/12+9/7-2/7-5/12
=1+1
=2
c)
7/13-(4/7-6/13)
=7/13-4/7+6/13
=1-4/7
=3/7
a) 17/23 + (1 - 17/23)
= 17/23 + 1 - 17/23
= (17/23 - 17/23) + 1
= 0 + 1 = 1
b) 17/12 + 9/7 - (2/7 + 5/12)
= 17/12 + 9/7 - 2/7 - 5/12
= (17/12 - 5/12) + (9/7 - 2/7)
= 1 + 1 = 2
c) 7/13 - (4/7 - 6/13)
= 7/13 - 4/7 + 6/13
= (6/13 + 6/12) - 4/7
= 1 - 4/7 = 3/7
d) 7/18 + 3/16 + 11/18 + 13/16
= (7/18 + 11/18) + (3/16 + 13/16)
= 1 + 1 = 1
d) sửa 7/18 + 3/16 + 11/18 + 13/16
= (7/18 + 11/18) + (3/16 + 13/16)
= 1 + 1
= 2
\(\frac{5}{7}+\frac{3}{4}=\frac{41}{28}\)\(Đ\)
\(3+\frac{2}{5}=1\)\(S\)
\(\frac{11}{9}-\frac{5}{6}=\frac{7}{18}\)\(Đ\)
\(4-\frac{3}{7}=\frac{25}{7}\)\(Đ\)
\(x+\frac{4}{11}=\frac{3}{5}\).
\(x=\frac{3}{5}-\frac{4}{11}\)
\(x=\frac{13}{55}\)
Vậy ta chọn câu C
dung hay sai
5/7 + 3/4 = 41/28 .....Đ...
3 + 2/5 = 1....S....
11/9 - 5/6 = 7/18....Đ...
4 - 3/7 = 25/7.....
tim x
x + 4/11 =3/5
Đáp án : C .13/55
\(26:\frac{13}{17}.\frac{34}{7}\)
\(=26.\frac{17}{13}.\frac{34}{7}=2.17.\frac{34}{7}=34.\frac{34}{7}\)
\(=\frac{1156}{7}\)
11 / 3 . 21 / 91 - 5 / 18
= 11 / 13 - 5 / 18
= 133 / 234