tính
a.2/5+3/4 b.2/7+5/9 c4/7+3/4+2/7
nhanh nhanh giúp mik nha
giải hộ mik nha , giải rõ ràng , chi tiết cho mik ra nhá
Bài 1 : Tính
a) \(\dfrac{7}{12}+\dfrac{3}{4}\) x \(\dfrac{2}{9}\) b) \(\dfrac{8}{9}-\dfrac{4}{15}\) : \(\dfrac{2}{5}\)
\(a,\dfrac{7}{12}+\dfrac{3}{4}\times\dfrac{2}{9}=\dfrac{7}{12}+\dfrac{1}{6}=\dfrac{7}{12}+\dfrac{2}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)
\(b,\dfrac{8}{9}-\dfrac{4}{15}:\dfrac{2}{5}=\dfrac{8}{9}-\dfrac{4}{15}\times\dfrac{5}{2}=\dfrac{8}{9}-\dfrac{2}{3}=\dfrac{8}{9}-\dfrac{6}{9}=\dfrac{2}{9}\)
Đáp án a là 0,75
Đáp án b: là 0.86222222222
Tính
a 2/8 + 1/5
b 13 / 7 - 3/5
c 5/9 x 31
d 2/7 + 4/5 : 2/3
nhanh nhanh giúp mình đi mà mình đang cần gấp
a,\(=\dfrac{9}{20}\)
b,\(=\dfrac{44}{35}\)
c,\(=\dfrac{155}{9}\)
d,\(=\dfrac{52}{35}\)
Bài 4: Tính nhanh
A) 7/8 + 7/12 + 9/8 + 5/12 =
B) 2/5 x 4/7 - 3/7 x 2/5 =
các bn giúp mik bài 4 nha mik đang cần gấp
A\(\frac{7}{8}+\frac{7}{12}+\frac{9}{8}+\frac{5}{12}\)
\(=\left(\frac{7}{12}+\frac{5}{12}\right)+\left(\frac{7}{8}+\frac{9}{8}\right)\)
\(=1+2\)
\(=3\)
a)16/9+3/5
b)4/13--12/7
c)-3/2+4/5
d)3/-4-1/4
e)-1/5.5/7
f)7/8.64/49
g)3/4:15/24
h)5/6:(4/3+3/4)
i)1/2-(1/3+2/3)
k)4/9+1/2.2/3
l)1/2+3/4-(3/4-4/5)
giải nhanh giúp mik vs nha do mình đang cần gấp
a\()\) 16/9 +3/5
=107/45
b\()\) 4/13--2/17
=51/221--26/221
=77/221
c\()\) -3/2+4/5
=-15/10+8/10
=-7/10
d\()\) 3/-4-1/4
=-1
e\()\) -1/5.5/7
=-1/7
f\()\) 7/8.64/49
=8/7
g\()\) 3/4.15/24
=15/32
Tính 9/5 + 3/4 4/7 x 3/8 6/7 x 2/3 - 2/7 3/5 - 2/9 5/9 ÷ 5/6 4/5 ÷2/5 x 1/4
Nhanh giúp mik nhá
= 51/20
----------------------------------
= 3/14
------------------------------------
= 4/7 - 2/7
= 2/7
--------------------------------------
= 17/45
---------------------------------------
= 2/3
--------------------------------------
= 2 x 1/4
= 1/2
tính
1/2 + 3/4 - 5/6
( 5/6 + 3/8 ) x 2/7
( 7/6 - 3/4 ) : 3/5
6/7 x 2/3 : 5/7
nhanh lên
`1/2+3/4-5/6=6/12+9/12-10/12=5/12`
`(5/6+3/8)xx2/7=(20/24+9/24)xx2/7=29/24xx2/7=29/84`
`(7/6-3/4):3/5=(14/12-9/12)xx5/3=5/12xx5/3=25/36`
`6/7xx2/3:5/7=6/7xx2/3xx7/5=4/5`
` 1/2 + 3/4 - 5/6 = 6/12 + 9/12 - 10/12 = 5/12`
` ( 5/6 + 3/8) xx 2/7 = ( 20/24 + 9/24) xx 2/7 = 29/24 xx 2/7 = 29/84`
` ( 7/6 - 3/4) : 3/5 = ( 14/12 - 9/12) : 3/5 = 5/12 : 3/5 = 5/12 xx 5/3 = 25/36`
` 6/7 xx 2/3 : 5/7 = 6/7 xx 2/3 xx 7/5 = 4/5`
` 1/2 + 3/4 - 5/6 = 6/12 + 9/12 - 10/12 = 5/12`
` ( 5/6 + 3/8) xx 2/7 = ( 15/24 + 9/24) xx 2/7 = 29/24 xx 2/7 = 29/84`
` ( 7/6 - 3/4) : 3/5 = ( 14/12 - 9/12) : 3/5 = 5/12 : 3/5 = 5/12 xx 5/3 = 25/36`
` 6/7 xx 2/3 : 5/7 = 6/7 xx 2/3 xx 7/5 = 4/5`
Mọi người giúp mik bài này
Thực hiện phép tính
a) -5/6 + 3/4 b) -2/3 - 1/12 + 3/8
c) -3/7 . 5/8 + 3/7 . -11/8 d) -5/12 : (2/3 -1/2) mũ 2
Mn ch mik xin cái lời giải lun nha
mik cảm ơn
Bài 4: Tính nhanh
A) 7/8 + 7/12 + 9/8 + 5/12=
B) 2/5x4/7-3/7x2/5 =
các bn giúp mik nhanh nha
A\(\frac{7}{8}+\frac{7}{12}+\frac{9}{8}+\frac{5}{12}\)
\(=\left(\frac{7}{8}+\frac{9}{8}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)\)
\(=1+2\)
\(=3\)
B\(\frac{2}{5}\times\frac{4}{7}-\frac{3}{7}\times\frac{2}{5}\)
\(=\left(\frac{4}{7}-\frac{3}{7}\right)\times\frac{2}{5}\)
\(=\frac{1}{7}\times\frac{2}{5}\)
\(=\frac{2}{35}\)
tính
a,\(6\dfrac{4}{5}-\left(1\dfrac{2}{3}+3\dfrac{4}{5}\right)\)
b,\(7\dfrac{5}{9}-\left(2\dfrac{3}{4}+3\dfrac{5}{9}\right)\)
c,\(6\dfrac{7}{7}-\left(1\dfrac{3}{4}+2\dfrac{5}{7}\right)\)
a: \(=6+\dfrac{4}{5}-1-\dfrac{2}{3}-3-\dfrac{4}{5}\)
\(=2-\dfrac{2}{3}=\dfrac{4}{3}\)
b: \(=7+\dfrac{5}{9}-2-\dfrac{3}{4}-3-\dfrac{5}{9}=2-\dfrac{3}{4}=\dfrac{5}{4}\)
c: =6+7/7-1-3/4-2-5/7
=3+2/7-3/4
=84/28+8/28-21/28
=84/28-13/28
=71/28