Tính hợp lí:
a) 114/7 : (-3/5) + 198/7 :3/5
b) 3/5 : (-1/15 - 1/6) + 3/5 : (-1/3 - 16/15)
c) 24.26/ (25)2 - 25.153/ 63.102
Ai giúp tớ vs! Tớ cảm ơn -))
mng giúp tớ vs aaa!!!tớ đng cần rất gấp aaa, cảm ơn mng trước aa!!
bài khá dài nên mng thông cảm, và giúp tớ aa!! iuu các cauu
1. a, 4 4/9 : 2 2/3 + 3 1/6
b, ( 15, 25 + 3,75) x 4+(20,71 +5,29)x5
c, 4/5 x 1/2 + 4/5 x1/3 - 4/5 x 1/4
d, 1 5/7 +7 3/6 + 2 2/7 - 4 3/6
e, 8,4 x X + 1,6 x X = 10
cảm ơn mng rất nhieuu aaa
Bài 1:
câu a: 4\(\dfrac{4}{9}\) : 2\(\dfrac{2}{3}\) + 3\(\dfrac{1}{6}\)
= \(\dfrac{40}{9}\) : \(\dfrac{8}{3}\) + \(\dfrac{19}{6}\)
= \(\dfrac{5}{3}\) + \(\dfrac{19}{6}\)
= \(\dfrac{10}{6}\) + \(\dfrac{19}{6}\)
= \(\dfrac{29}{6}\)
b, (15,25 + 3,75) \(\times\) 4 + ( 20,71 + 5,29)\(\times\) 5
= 19 \(\times\) 4 + 26 \(\times\) 5
= 76 + 130
= 206
c, \(\dfrac{4}{5}\) \(\times\) \(\dfrac{1}{2}\) + \(\dfrac{4}{5}\) \(\times\) \(\dfrac{1}{3}\) - \(\dfrac{4}{5}\) \(\times\) \(\dfrac{1}{4}\)
= \(\dfrac{2}{5}\) + \(\dfrac{4}{15}\) - \(\dfrac{1}{5}\)
= \(\dfrac{6}{15}\) + \(\dfrac{4}{15}\) - \(\dfrac{3}{15}\)
= \(\dfrac{7}{15}\)
d, 1\(\dfrac{5}{7}\) + 7\(\dfrac{3}{6}\) + 2\(\dfrac{2}{7}\) - 4\(\dfrac{3}{6}\)
= (1 + 2 + \(\dfrac{5}{7}\) + \(\dfrac{2}{7}\)) + ( 7 + \(\dfrac{3}{6}\) - 4 - \(\dfrac{3}{6}\))
= 3 + 1 + 3
= 7
e, 8,4 \(\times\) \(x\) + 1,6 \(\times\) \(x\) = 10
(8,4 + 1,6) \(\times\) \(x\) = 10
10 \(\times\) \(x\) = 10
\(x\) = 1
Tính bằng cách hợp lí:
a)A=39/91 +35/40 +60/105 -15/8
b)B=1/2 +1/3 +4/5 +1/6 +3/8 -7/40
Giúp tớ với a,tớ đg cần gấp aaa!Cảm ơn trc a
a: \(=\dfrac{3}{7}+\dfrac{7}{8}+\dfrac{4}{7}-\dfrac{15}{8}=1-1=0\)
b: \(=\dfrac{1}{2}+\dfrac{4}{5}+\dfrac{3}{8}-\dfrac{7}{40}+\dfrac{1}{2}\)
\(=1+\dfrac{32+15-7}{40}=1+1=2\)
1, Thực hiện phép tính :
A = 15/34 + 7/21 + 9/34 - 32/17 + 2/3
B = 114/7 : ( - 3/5) - 198/7 : (-3/5)
C = 25 . ( -1/3 ) + 1/5 - 2.(-1/2)^2 - 1/2
D = ( -2)^3 . ( 3/4 - 0,25 ) : ( 9/4 - 7/6 )
Giúp mình nhé ! cảm ơn các bạn !
bài 1 Tính:
a) 5/17 * 8/-7+8/17*-7/3+-7/3*4/17
b) -10/13 + 5/17 - 3/13 + 12/17 - 11/20
giúp tớ vs ạ. Tớ CẢM ƠN
*tớ thêm một câu nữa ạ
c) 5/9 * 7/13 + 5/9 * 9/13 + 3/13 * -5/9
a) 5/17 * 8/-7+8/17*-7/3+-7/3*4/17
-40/119 + 12/17 × -7/3
-40/119 + -28/17 =-236/119
b) -10/13 + 5/17 - 3/13 + 12/17 - 11/20
(5/17+12/17)-(10/13+3/13)-11/20
-11/20
a) 5/17 * 8/-7+8/17*-7/3+-7/3*4/17
-40/119 + 12/17 × -7/3
-40/119 + -28/17 =-236/119
b) -10/13 + 5/17 - 3/13 + 12/17 - 11/20
(5/17+12/17)-(10/13+3/13)-11/20
-11/20
a! giúp tớ với, giải hộ tớ bài này nha:
a. 2/5+1/4
b. 1/12+3/4+-2/9
c.4/7+3/5+1/3
d.2/7+-3/8+4/7+1/7+-5/8
e. 1/3+-3/4+3/5+1/57+-1/36+1/15+-2/9
giải nhanh hộ tớ nhé , tớ gấp lắm rồi , rất cảm ơn mọi người
/ nghĩa là phần nhé , còn - nghĩa là số nguyên âm đó
ôi ai giải nhanh bài này tớ cho một tick nên làm nhanh tay nhé
a ) 13/20
B)
C..........................................................
minh dang tính
GIÚP TỚ VỚI !!!
( 4/5/57 - 3/4/51 + 8/13/29 ) - ( 3/5/57 - 6/16/29)
6/7 + 5/8 : 5 - 3/16 . ( -2 )²
1/13/15 . 0, 75 - ( 104/195 + 25% ) . 24/47 - 3/12/13 : 3
Bài 1: Tính nhanh
a) -5/7-(-5/67) + 13/30 + 1/2 + (-11/6) + 17/14 - (-2/5) b) 3/5 : (-1/15 - 1-6) +3/5 : (1/3 + 16/15 c) (3 - 1/4 + 2/3)-(5 - 1/3 - 6/5) - (6 - 7/4 + 3/2) d) 1/3 + 1/3^2 + 1/3^3 +......+ 1/3^2004 + 1/3^2005 Mọi người giúp em với em cảm ơn ạ =))))))))
bài 5: tính giá trị biểu thức sau một cách hợp lí
A = -7/21 + ( 1+1/3) B=2/15 +(5/9+ -6/9)
C=9-1/5 + 3/12 ) + -3/4
bài 6
a) x + 7/8 = 13/12 b) - (-6)/12 - x = 9/48
c) x+ 4/6 = 5/25 - (-7)/15 c) x + 4/5 = 6/20 - (-7)/3
`5`
`a, -7/21 +(1+1/3)`
`=-7/21 + ( 3/3 + 1/3)`
`=-7/21+ 4/3`
`=-7/21+ 28/21`
`= 21/21`
`=1`
`b, 2/15 + ( 5/9 + (-6)/9)`
`= 2/15 + (-1/9)`
`= 1/45`
`c, (9-1/5+3/12) +(-3/4)`
`= ( 45/5-1/5 + 3/12)+(-3/4)`
`= ( 44/5 + 3/12)+(-3/4)`
`= 9,05 +(-0,75)`
`=8,3`
`6`
`x+7/8 =13/12`
`=>x= 13/12 -7/8`
`=>x=5/24`
`-------`
`-(-6)/12 -x=9/48`
`=> 6/12 -x=9/48`
`=>x= 6/12-9/48`
`=>x=5/16`
`---------`
`x+4/6 =5/25 -(-7)/15`
`=>x+4/6 =1/5 + 7/15`
`=> x+ 4/6=10/15`
`=>x=10/15 -4/6`
`=>x=0`
`----------`
`x+4/5 = 6/20 -(-7)/3`
`=>x+4/5 = 6/20 +7/3`
`=>x+4/5 = 79/30`
`=>x=79/30 -4/5`
`=>x= 79/30-24/30`
`=>x= 55/30`
`=>x= 11/6`
\(5)\)
\(A=\dfrac{-7}{21}+\left(1+\dfrac{1}{3}\right)\)
\(A=\dfrac{-7}{21}+\dfrac{4}{3}\)
\(A=\dfrac{-7}{21}+\dfrac{28}{21}\)
\(A=1\)
\(--------------\)
\(B=\dfrac{2}{15}+\left(\dfrac{5}{9}+\dfrac{-6}{9}\right)\)
\(B=\dfrac{2}{15}+\dfrac{-1}{9}\)
\(B=\dfrac{18}{135}+\dfrac{-15}{135}\)
\(B=\dfrac{1}{45}\)
\(------------\)
\(C=9-\dfrac{1}{5}+\dfrac{3}{12}+\dfrac{-3}{4}\)
\(C=\dfrac{44}{5}+\dfrac{3}{12}+\dfrac{-3}{4}\)
\(C=\dfrac{528}{60}+\dfrac{15}{60}+\dfrac{-3}{4}\)
\(C=\dfrac{181}{20}+\dfrac{-3}{4}\)
\(C=\dfrac{181}{20}+\dfrac{-15}{20}\)
\(C=\dfrac{83}{10}\)
\(6)\)
\(a)\) \(x+\dfrac{7}{8}=\dfrac{13}{12}\)
\(x=\dfrac{13}{12}-\dfrac{7}{8}\)
\(x=\dfrac{104}{96}-\dfrac{84}{96}\)
\(x=\dfrac{5}{24}\)
\(b)\) \(\dfrac{-6}{12}-x=\dfrac{9}{48}\)
\(\dfrac{-1}{2}-x=\dfrac{3}{16}\)
\(x=\dfrac{-1}{2}-\dfrac{3}{16}\)
\(x=\dfrac{-8}{16}-\dfrac{3}{16}\)
\(x=\dfrac{-11}{16}\)
\(c)\) \(x+\dfrac{4}{6}=\dfrac{5}{25}-\left(-\dfrac{7}{15}\right)\)
\(x+\dfrac{4}{6}=\dfrac{5}{25}+\dfrac{7}{15}\)
\(x+\dfrac{4}{6}=\dfrac{75}{375}+\dfrac{105}{375}\)
\(x+\dfrac{4}{6}=\dfrac{12}{25}\)
\(x=\dfrac{12}{25}-\dfrac{4}{6}\)
\(x=\dfrac{72}{150}-\dfrac{100}{150}\)
\(x=\dfrac{-14}{75}\)
\(d)\) \(x+\dfrac{4}{5}=\dfrac{6}{20}-\left(-\dfrac{7}{3}\right)\)
\(x+\dfrac{4}{5}=\dfrac{6}{20}+\dfrac{7}{3}\)
\(x+\dfrac{4}{5}=\dfrac{18}{60}+\dfrac{140}{60}\)
\(x+\dfrac{4}{5}=\dfrac{79}{30}\)
\(x=\dfrac{79}{30}-\dfrac{4}{5}\)
\(x=\dfrac{79}{30}-\dfrac{24}{30}\)
\(x=\dfrac{11}{6}\)
Giải:
\(A=\dfrac{-7}{21}+\left(1+\dfrac{1}{3}\right)\)
\(A=\dfrac{-7}{21}+\dfrac{4}{3}\)
\(A=\dfrac{-7}{21}+\dfrac{28}{21}\)
\(A=\dfrac{21}{21}=1\)
\(B=\dfrac{2}{15}+\left(\dfrac{5}{9}+\dfrac{-6}{9}\right)\)
\(B=\dfrac{2}{15}+\dfrac{-1}{9}\)
\(B=\dfrac{6}{45}+\dfrac{-5}{45}\)
\(B=\dfrac{1}{45}\)
\(C=\left(9-\dfrac{1}{5}+\dfrac{3}{12}\right)+\dfrac{-3}{4}\)
\(C=\left(\dfrac{44}{5}+\dfrac{1}{4}\right)+\dfrac{-3}{4}\)
\(C=\dfrac{181}{20}+\dfrac{-3}{4}\)
\(C=\dfrac{181}{20}+\dfrac{-15}{20}\)
\(C=\dfrac{166}{20}\)
Bài 6:
\(a)x+\dfrac{7}{8}=\dfrac{13}{12}\)
⇔\(x=\dfrac{13}{12}-\dfrac{7}{8}=\dfrac{5}{24}\)
\(b)\dfrac{-6}{12}-x=\dfrac{9}{48}\)
⇔\(x=\dfrac{-6}{12}-\dfrac{9}{48}=\dfrac{-11}{16}\)
\(c)x+\dfrac{4}{6}=\dfrac{5}{25}-\dfrac{-7}{15}\)
\(\Leftrightarrow x+\dfrac{2}{3}=\dfrac{2}{3}\)
\(\Leftrightarrow x=\dfrac{2}{3}-\dfrac{2}{3}=0\)
\(d)x+\dfrac{4}{5}=\dfrac{6}{20}-\dfrac{-7}{3}\)
⇔\(x+\dfrac{4}{5}=\dfrac{79}{30}\)
⇔\(x=\dfrac{79}{30}-\dfrac{4}{5}=\dfrac{11}{6}\)
Các cậu giúp tớ với,plsss
Bài 1: Thực hiện phép tính a) 1 2 + −3 5
b) −2 3 + 5 7
c) 4 5 − 5 3
d) −3 4 − 5 8
𝑒) 2 3 . 6 8
f) −3 4 . 8 9
g) −5 7 : 15 14
h) 2 3 : −10 15
Bài 2: Thực hiện phép tính a) 4 5 + 2 3 : 5 6
b) 1 5 − 2 3 : 5 6
c) 4 7 + 2 3 : 5 9
d) 1 3 − 2 3 : 5 6
e) 12. ( −2 3 ) 2 + 5 6
f) 18. ( −1 3 ) 3 + 5 6
g) 8. ( −2 3 ) 3 + 1 6
h) 10. ( −1 2 ) 3 + 5
mà bài dài quá sao làm hết dc