I dont know this : (hỗn số) 8 2/7 - (3 4/9 +4 2/7)
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\(9\frac{1}{4}+6\frac{2}{7}+7\frac{3}{5}+8\frac{2}{3}+\frac{2}{5}+\frac{1}{3}+\frac{5}{7}+\frac{3}{4}\)
\(=\left(9\frac{1}{4}+\frac{3}{4}\right)+\left(6\frac{2}{7}+\frac{5}{7}\right)+\left(7\frac{3}{5}+\frac{2}{5}\right)+\left(8\frac{2}{3}+\frac{1}{3}\right)\)
\(=\left(\frac{37}{4}+\frac{3}{4}\right)+\left(\frac{44}{7}+\frac{5}{7}\right)+\left(\frac{38}{5}+\frac{2}{5}\right)+\left(\frac{26}{3}+\frac{1}{3}\right)\)
\(=\frac{40}{4}+\frac{49}{7}+\frac{40}{5}+\frac{40}{5}+\frac{27}{3}\)
\(=10+7+8+8+9\)
\(=42\)
**** nha Bùi Xuân Lê
b: \(=8+\dfrac{7}{12}-5-\dfrac{3}{8}=3+\dfrac{5}{24}=\dfrac{77}{24}\)
Huỳnh Đăng Khôi bạn có thể tham khảo nhé!! Nếu đag xử dụng máy tính cách ghi phân số!Chúc bạn học tốt!!
a) = 17/19 - 17/19 + 27/35 + 35/35 = 0 + 62/35
b) = 1/3 x 4/5 + 1/3 x6/5 + 1/3 x 2 = 1/3(4/5 + 6/5 + 2) = 1/3 x 4 = = 4/3
c) 4/7 x 2/9 + 4/7 x 7/9 + 2/3 = 4/7 x (2/9 + 7/9) + 2/3 = 4/7 x 1 + 2/3 = 26/21
A) 17/19 - 17/19 + 27/35 + 35/35 = 0 + 62/35
B) 1/3 x 4/5 + 1/3 x 6/5 + 1/3 x 2 = 1/3 x(4/5 + 6/5 x 2 ) = 1/3 x 4 = 4/3
c) TƯƠNG TỰ CÂU A VÀ B
* HOKTOT*
NHA
\(\left(13\frac{3}{7}+4\frac{5}{13}\right)-8\frac{3}{7}\)
\(=\left(\frac{94}{7}+\frac{57}{13}\right)-\frac{59}{7}\)
\(=\frac{1621}{91}-\frac{59}{7}\)
\(=\frac{122}{3}\)
\(\left(6-2\frac{4}{5}\right)\cdot3\frac{1}{8}-1\frac{3}{5}:\frac{1}{4}\)
\(=\left(6-\frac{14}{5}\right)\cdot\frac{25}{8}-\frac{8}{5}\cdot\frac{4}{1}\)
\(=\frac{16\cdot25}{5\cdot8}-\frac{8\cdot4}{5\cdot1}\)
\(=10-\frac{32}{5}\)
\(=\frac{18}{5}\)
1.We give each other presenrs.......at.....Christmas
2.Dont's sit ......on......the floor
3.I'm going away .......until.....the end of January
4.I met Tom ......in......the Street yesterday
5.They sent me a cheque ....for.....
$50
6.There has been some decrease .......in.......military spending this year
7.Nobody know's what the cause ......for.......the explosion was
8.Do you think we'll find a solution .......for......this problem ?
9.Have you ever read any books .........by.....Mark Twain
2:
a: =4+3/8+5+2/3
=9+3/8+2/3
=216/24+9/24+16/24
=216/24+25/24
=241/24
b; =2+3/8+1+1/4+3+6/7
=6+3/8+1/4+6/7
=6+5/8+6/7
=419/56
c: \(=2+\dfrac{3}{8}-1-\dfrac{1}{4}+5+\dfrac{1}{3}\)
=6+3/8-1/4+1/3
=6+1/8+1/3
=6+11/24
=155/24
d: \(=3+\dfrac{5}{6}+6\cdot\dfrac{13}{6}\)
=3+13+5/6
=16+5/6
=101/6
e: =3+1/2+4+5/7-5-5/14
=3+4-5+1/2+5/7-5/14
=2+7/14+10/14-5/14
=2+12/14
=2+6/7=20/7
f: =9/2+1/2:11/2
=9/2+1/11
=99/22+2/22=101/22
\(8\frac{2}{7}-\left(3\frac{4}{9}+4\frac{2}{7}\right)\)
\(=8\frac{2}{7}-3\frac{4}{9}-4\frac{2}{7}\)
\(=\left(8\frac{2}{7}-4\frac{2}{7}\right)-3\frac{4}{9}\)
\(=4-3\frac{4}{9}\)
\(=3\frac{9}{9}-3\frac{4}{9}\)
\(=\frac{5}{9}\)