thực hiện phép tính
12/35+5/21-26/21+23/35-1/3
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c) Ta có: \(\dfrac{3}{5}+\dfrac{-5}{20}+\dfrac{30}{75}+\dfrac{-7}{4}\)
\(=\dfrac{3}{5}+\dfrac{2}{5}+\dfrac{-1}{4}+\dfrac{-7}{4}\)
\(=1-2=-1\)
Giải:
a)-1/12+4/3=-1/12+16/12=15/12=5/4
b)(-4/14-3/15)-(1/5-20/35-(-1)).7
=-17/35-22/35.7
=-17/35-22/5
=-171/35
c)3/5+-5/20+30/75+-7/4
=3/5+-1/4+2/5+-7/4
=(3/5+2/5)+(-1/4+-7/4)
=1+-2
=-1
d)5/6.-12/14+7/13
=-5/7+7/13
=-16/91
e)2/-9-5/-36-1/4
=-1/12-1/4
=-1/3
f)2/23+-5/12+7/18+21/23+-7/12
=(2/23+21/23)+(-5/12+-7/12)+7/18
=1+-1+7/18
=7/18
2:
a: x+201=351
=>x=351-201
=>x=150
b: \(8\cdot5^2-27:25\)
\(=8\cdot25-\dfrac{27}{25}\)
\(=200-1,08=198,92\)
d: \(2023-23:\left[9+2\left(2^3-0,21\right)\right]\)
\(=2023-23:\left[9+16-0,42\right]\)
\(=2023-\dfrac{23}{25-0,42}\)
\(=2023-\dfrac{1150}{1229}=\dfrac{2485117}{1229}\)
b: 2(x-21)=84
=>x-21=84/2=42
=>x=42+21=63
c: 135-4(81-x)=55
=>4(81-x)=135-55=80
=>81-x=20
=>x=61
1: \(\dfrac{4}{23}+\dfrac{5}{21}+\dfrac{1}{2}-\dfrac{4}{23}+\dfrac{16}{21}\)
\(=1+\dfrac{1}{2}\)
\(=\dfrac{3}{2}\)
2: \(\left(\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}\right)-\left(\dfrac{79}{67}-\dfrac{28}{41}\right)\)
\(=\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}-\dfrac{79}{67}+\dfrac{28}{41}\)
\(=\dfrac{1}{3}\)
a) 31 . { 330 : [178 – 4 . ( 35 – 21 : 3 )]} = 31 . { 330 : [178 – 4 . ( 35 – 7)]}
= 31 . { 330 : [178 – 4 . 28]} = 31 . { 330 : [178 – 112]}
= 31 . { 330 : 66 } = 31 . 5 = 155
a) (-98) + (-170)
= - (98 + 170)
= -268
b) 33 . (-21 ) - [(-21) . 7]
= (-21) . [33 - 7]
= (-21) . 26
= -546
c) (-235) + (-235) + (-240) + 475
= (-470) + (-240) + 475
= (-710) + 475
= -235
d) (-2) . [ 19 + (-87)]
= (-2) . (-68)
= 136
e) (-26) . 35 + 35 . (-74) + 110
= 35 . [(-26) + (-74)] + 110
= 35 . (-100) + 110
= (-3500) + 110
= -3390
f) (-97) + 35 + 97
= [(-97) + 97] + 35
= 0 + 35
= 35
g) (-125) + 431
= 306
h) 21 . (-9) + (-5) . (-31)
= (-189) + 155
= -34
i) (-523) + 310
= -213
j) -(-23) - 57
= 23 - 57
= -34
ukm cảm ơn bn đúng hay sao mk cx chưa bít nhưng cx tick cho bn
a) 31 . { 330 : [178 – 4 . ( 35 – 21 : 3 )]} = 31 . { 330 : [178 – 4 . ( 35 – 7)]}
= 31 . { 330 : [178 – 4 . 28]} = 31 . { 330 : [178 – 112]}
= 31 . { 330 : 66 } = 31 . 5 = 155
b) ( 5 19 . 5 14 ) : 5 32 = 5 33 : 5 32 = 5
12/35+5/21-26/21+23/35-1/3= -1/3 =)