Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,13-18-\left(-42\right)-15\)
\(=13-18+42-15\)
\(=\left(13-15\right)-\left(18+42\right)\)
\(=-2-60\)
\(=-62\)
\(b,369-4\left[\left(-5\right)+4.\left(-8\right)\right]\)
\(=369-4\left[\left(-5\right)+\left(-32\right)\right]\)
\(=369-4.\left(-37\right)\)
\(=369-\left(-148\right)\)
\(=369+148\)
\(=517\)
\(c,\left(-8\right)^3:\left(-8\right)^2+8\)
\(=-512:64+8\)
\(=-8+8\)
\(=0\)
\(d,\left(-12\right)\left(-13\right)+13.\left(-29\right)\)
\(=156+-377\)
\(=156-377\)
\(=-221\)
a, 13 - 18 - ( - 42 ) -1 5 = 22
c,(-8 ) ^ 3 : ( - 8 ) ^ 2 +8 = 0
a ) 13 - 18 - ( - 42 ) - 15
= 13 - 18 + 42 - 15
= -5 + 42 - 15
= 37 - 15
= 22
cái này dễ mak bn,hok lý thuyết ik,nhưng mk bt là bn bt lm bài này
\(-10< x< 8\)
\(\Rightarrow x\in\left\{-9;-8;...;7\right\}\)
\(x=-9+\left(-8\right)+...+7\)
\(\Rightarrow x=\left(-9\right)+\left(-8\right)=-17\)
P/s: Các câu còn lại tương tự ((:
a, \(-6x=18\)
\(\Rightarrow-x=3\)
\(\Rightarrow x=-3\)
b, \(2x-\left(-3\right)=7\)
\(2x+3=7\)
\(\Rightarrow2x=4\)
\(\Rightarrow x=2\)
c, \(\left(x-5\right)\left(x+6\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-5=0\\x+6=0\end{cases}\Rightarrow\orbr{\begin{cases}x=5\\x=-6\end{cases}}}\)
Bài 1:
a) 143-18-(-42)-15 = 125-(-42)-15= 167-15= 152
b) 369-4[(-5)+4.(-8)] = 369-4.(-37)= 369- (-148)= 517
c) (-8)3:(-8)2 +8 = (-512):64+8=(-8)+8= 0
d) (-12).(-13)+13.(-29)= 156+(-377)= -221
\(a,13-18-\left(-42\right)-15\)
\(=13-18+42-15\)
\(=-5-15+42=-20+42\)
\(=22\)
\(b,369-4.\left[\left(-5\right)+4.\left(-8\right)\right]\)
\(=369-4.\left[-5-32\right]\)
\(=369-4.\left(-37\right)\)
\(=369-\left(-148\right)=517\)
\(c,\left(-8\right)^3:\left(-8\right)^2+8\)
\(=-8+8=0\)
\(d,\left(-12\right).\left(-13\right)+13.\left(-29\right)\)
\(=12.13+13.\left(-29\right)\)
\(=13.\left(12-29\right)\)
\(=13.\left(-17\right)=-221\)
\(e,-2-13+\left(-14\right)-19\)
\(=-2-13-14-19\)
\(=-\left(2+13+14+19\right)=-48\)
\(f,323-6.\left[3-7.\left(-9\right)\right]\)
\(=323-6.\left[3+63\right]\)
\(=323-6.66=323-396\)
\(=-73\)
\(g,-19-13-\left(-24\right)+11\)
\(=-19-13+24+11\)
\(=-32+35=3\)
\(h,-15.12-8.\left(-12\right)\)
\(=-15.12+8.12\)
\(=12.\left(8-15\right)=12.7=84\)
a.17 - 25 + 55 - 7 = (17-17) + (55-25)
= 0 + 30
= 30
b.25 - (-75) + 32-(32+75)= 25 - (-75+75) + (32-32 )
= 25 - 0+0
= 25
c.(-5).8.(-2).3=(-5.-2).(8.3)
= 10.24
=240
d.(-127) - 18.(5 - 6)=(-127) - (-18)
-109
e.210 + [46 + (-210) + (-26)]= [210 + ( -210) ] + [46 + (-26)]
= 0 + 20
= 20
f.( - 8 ) - [(-5)+8] = (-8) - 3
= -11
g.25.134+25.(-34)=25.[134+(-34)]
= 25.100
= 2500
h.13 - 18 - (-42) - 15 = (13 - 18) - (-42) - 15
= -5 - (-42) - 15
=-5 - 15 - (- 42)
= -20 - (-42)
=22
i.369 - 4[(-5)+4.(-8)]= 369 - 4 . [-5+4.(-8)]
= 369 - 4.-37
= 369 - (-148)
= -592
k.-8^3:-8^2+8 = [(-8)^3:(-8)^2]+8
= -8+8
= 0
m. -12.(-13)+13.(-29)=13.[12+(-29)]
= 13.-17
=-221
a) \(13-18-\left(-42\right)-15\)
\(=13-18+42-15\)
\(=\left(13-18-15\right)+42\)
\(=-20+42\)
\(=22\)
b) \(369-4.\left[-5+4.\left(-8\right)\right]\)
\(=369-4.\left[-5+\left(-32\right)\right]\)
\(=369-4.\left(-37\right)\)
\(=369+148\)
\(=517\)
c) \(\left(-8\right)^3\div\left(-8\right)^2+8\)
\(=-8+8\)
\(=0\)
d) \(\left(-12\right).\left(-13\right)+13.\left(-29\right)\)
\(=12.13+13.\left(-29\right)\)
\(=13.\left(-29+12\right)\)
\(=13.\left(-17\right)\)
\(=-221\)