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a ) 2 15 b ) − 2 5 c ) 1 d ) 1 e ) − 5 3 f ) 0 g ) 2 3 5 h ) 1
d) Ta có: \(-8+\left(-14\right)+34+\left(-12\right)\)
\(=-8-14+34-12\)
\(=-20+20\)
\(=-0\)
e) Ta có: \(\left(-7\right)+\left(-20\right)+57+\left(-30\right)\)
\(=\left(-7+57\right)+\left(-20-30\right)\)
\(=50-50=0\)
f) Ta có: \(300-\left(-180\right)-120-42\)
\(=300+180-120-42\)
\(=258+60=318\)
d, Ta có : \(\left(-8\right)+\left(-14\right)+34+\left(-12\right)\)
\(=-\left(8+12\right)+34-14=-20+20=0\)
e, Ta có : \(\left(-7\right)+\left(-20\right)+57+\left(-30\right)\)
\(=-\left(30+20\right)+57-7=-50+50=0\)
f, Ta có : \(300-\left(-180\right)-120-42=318\)
Bài 2:
a: =>x-35=-23
=>x=12
b: =>|x-8|=13
=>x-8=13 hoặc x-8=-13
=>x=21 hoặc x=-5
Bài 1:
a: =42-98-42+12-12=-98
b: =10x4x3x(-25)=40x(-25)x3=-1000x3=-3000
a) \(17+188+183=205+183=388\)
b) \(80-\left[130-\left(12-4\right)^2\right]\)
\(=80-\left(130-64\right)\)
\(80-66=14\)
c) \(2^3.17-2^3.14\)
\(8.17-8.14\)
\(=8.\left(17-14\right)\)
\(=8.3=24\)
A) 195 x 63 + 37 x195
195 x ( 63 + 37 ) = 195 x 100
= 19500
B) 7^12 : 7^10 - 36 : 3^2
= 7^12-10 - 36 : 9
= 7^2 - 4 = 49 - 4 = 45
C) 180 - [130-(12-10)^3] + 2023^0
= 180 -(130-2^3)+1
= 180-130+8+1
= 50 + 8+1 = 59
\(a,195.63+37.195\)
\(=195\left(63+37\right)\)
\(=195.100\)
\(=19500\)
\(b,7^{12}:7^{10}-36:3^2\)
\(=7^2-2^2.3^2:3^2\)
\(=7^2-2^2\)
\(=49-4=44\)
\(c,180-\left[130-\left(12-10\right)^3\right]+2023^0\)
\(=180-\left[130-2^3\right]+1\)
\(=180-\left(130-8\right)+1\)
\(=180-122+1\)
\(=59\)
Có gì k hiểu thì ib nhá
a,(-19)+(-32)+2019+52 = -19 + 2019 + 52 - 32
= 2000 + 20
= 2020
b,34-(15+34-40)= 34 - 15 -34 + 40
= -15 + 40
= 25
c,-11.(-4)+6.(-5)= 44 + ( -30)
= 14
d,88.(12-67)-12.(88+67)= 88.12 - 5896 - 12.88 + 804
= -5896 + 804
= -5092
hok tốt!
a,(-19)+(-32)+2019+52
=(-19+2019)+(-32+52)
=2000+20
=2020
b,34-(15+34-40)
=34-15-34+40
=(34-34)-15+40
=0-15+40
=-15+40
=-25
c,-11.(-4)+6.(-5)
=44+(-30)
=14
d,88.(12-67)-12.(88+67)
=88.(-55)-12.155
=-4840-1860
=6700
a) 27.97-27.17+80.73
=27.(97-17)+80.73
=27.80+80.73
=80.(27+73)
=80.100
=8000
b) (-33)+36+(-39)+42+(-45)+48
=-33+36-39+42-45+48
=9