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a)(-12)+(-9)+112+|-30|
=(-21)+112+30
= 91+ 30
=121
b) - 2015 + (-268)+(-201)+168+301
=(-2283)+(-33)+301
=(-2316)+301
= - 2015
c)160 :{|-17|+[3x2x5-(14+2x11:2x8)]}
= 160 :{17+[3x2x5-(14+22:16)]}
=160:{17+[ 3x2x5-15,375]
=160:{17+30-15,375}
=160:31,625
=5,05
Câu 1:
\(a,=43\cdot\left(27+93\right)+3111+3363=43\cdot120+6474=11634\\ b,=11^2+2^{15}\cdot2^3:2^{17}=121+2=123\\ c,=11^2+7^2-9=121+49-9=151\)
Câu 2:
\(a,\Rightarrow x-\dfrac{3}{2}=5^2=25\\ \Rightarrow x=25+\dfrac{3}{2}=\dfrac{53}{2}\\ b,\Rightarrow7x=30-2=28\\ \Rightarrow x=4\)
a: =35/17-18/17-9/5+4/5
=1-1=0
b: =-7/19(3/17+8/11-1)
=7/19*18/187=126/3553
c: =26/15-11/15-17/3-6/13
=1-6/13-17/3
=7/13-17/3=-200/39
a, ( -12 ) + ( -9 ) + 121 + l -20 l
= [(-21)+121]+20
=100+20
=120
b, 95 : 93 - 32 . 3
=92-33
=(32)2-33
=34-33
=81-27
=54
c, 160 : { l -17 l + [ 32 . 5 - ( 14 + 211 : 28 ) ] }
= 160 : { 17 +[9.5-(14+23)]}
=160 : {17+[9.5 - (14+8)]}
=160 : {17+[9.5-22]}
=160 : {17+[45-22]}
=160 : (17+23)
= 160 : 40
=4
a, ( - 168 ) + 72 . ( - 168 ) + ( - 168 ) . 27
= ( - 168 ) + ( - 12096 ) + ( - 4536 )
= - 12264 + - 4536
= - 16800
b, 22 . ( - 3 ) - ( 110 + 8 ) : ( - 3 )2
= 4 . ( - 3 ) - ( 1 + 8 ) : 9
= ( - 12 ) - 9 : 9
= ( - 12 ) - 1
= - 13
c, ( - 1075 ) - ( 29 - 1075 )
= ( - 1075 ) - ( - 1046 )
= - 29
d, ( - 9 ) + ( - 11 ) + 21 + ( - 1 )
= - 20 + 21 + ( - 1 )
= 1 + - 1
= 0
e, 30 + 12 + ( - 20 ) + ( - 12 ) - ( 30 - 20 ) + ( 12 - 12 )
= 42 + ( - 20 ) + ( - 12 ) - 10 + 0
= 22 + ( - 12 ) - 10 + 0
= 10 - 10 + 0
= 0 + 0
= 0
g, ( 13 - 135 + 49 ) - ( 13 + 49 )
= [( - 122 ) + 49 ] - 62
= ( - 73 ) - 62
= - 135
h, 35 - { 12 - [ ( - 14 ) + ( - 2 ) } ]
= 35 - { 12 - ( - 16 ) }
= 35 - 28
= 7
Bài 2:
a. x - 35 = ( - 12 ) - 3
x - 35 = - 15
x = - 15 + 35
x = 20
b, \(\frac{1}{4}\)+ \(\frac{1}{3}\): 3x = - 5
\(\frac{3}{12}+\frac{4}{12}\): 3x = - 5
\(\frac{7}{12}\): 3x = - 5
3x = \(\frac{7}{12}\): - 5
3x = \(\frac{-7}{60}\)
x = \(\frac{-7}{60}\): 3
x = \(\frac{-7}{180}\)
c,2x-1 = 8
2x-1 = 24
x = 4 + 1
x = 5
a: \(=112-12-9+30=100+21=121\)
b: \(=-2015+\left(-268+168\right)+\left(-201+301\right)\)
=-2015
c: \(=160:\left\{17+\left[9\cdot5-\left(14+8\right)\right]\right\}\)
\(=160:\left\{17+45-42\right\}=160:20=8\)