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a)35-(12-(-14+(-2)))
=35-(12-(-12))
=35-(12+12)
=35-24
=11
b)49-(-54)-23
=49+54-23
=103-23
=80
c)5871:(928-((-82)+247))×5)
=5871:(928-165×5)
=5871:(928-825)
=5871:103
=57
\(16+\left(-6\right)+\left(-8\right)+7\)\(=16-6-8+7\)\(=\left(16-6\right)-\left(8-7\right)\)\(=10-1=9\)
\(\left(-8\right)-[\left(2015^0\right)-14+7]\)\(=-8-\left(1-14+7\right)\)\(=-8-\left(-6\right)=-2\)
\(\left(-31\right)-[82-\left(-17\right)]\)\(=-31-\left(82+17\right)\)\(=-31-99=-130\)
\(6\left(-2\right)^3+5\left(-4\right)-\left(-12\right)\)\(=6\left(-8\right)+\left(-20\right)+12\)\(=-48-20+12=-56\)
\(5x+2x=6^2-5^0\Leftrightarrow5x+2x=6^2-1\)
\(\Leftrightarrow5x-2x=36-1\Leftrightarrow5x-2x=35\Leftrightarrow x\left(5+2\right)=35\)
\(\Leftrightarrow7x=35\Leftrightarrow x=35:7\Leftrightarrow x=5\)
\(5x+x=150:2+3\Leftrightarrow5x+x=75+3\)
\(\Leftrightarrow5x+x=78\Leftrightarrow x\left(5+1\right)=78\Leftrightarrow x6=78\)
\(\Leftrightarrow x=78:6\Leftrightarrow x=13\)
a) 5x + 2x = 62 - 50
7x = 35 => x = 5
b) 5x + x = 150 : 2 + 3
6x = 78 => x = 13
c) 6x + x = 511 : 59 + 31
7x = 28 => x = 4
d) 5x + 3x = 36 : 33 x 4 + 12
8x = 120 => x = 15
e) 4x + 2x = 68 - 219 : 216
6x = 60 => x = 10
f) 5x + x = 39 - 311 : 39
6x = 30 => x = 5
g) 7x - x = 521 : 519 + 3 x 22 - 70
6x = 36 => x = 6
h) 7x - 2x = 617 : 615 + 44 : 11
5x = 40 => x = 8
\(a/\) \(\left(-77\right)+27=\left(-50\right)\)
\(b/\left(-146\right)+\left(-54\right)=\left(-200\right)\)
\(c/-\left(19-82\right)+\left(98-82\right)\)
\(=-\left(-63\right)+16\)
\(=\left(-47\right)\)
\(d/\left|-6\right|+\left(-7\right)+\left|-4\right|+\left(-3\right)\)
\(=6+\left(-7\right)+4+\left(-3\right)\)
\(=6+4-7-3=0\)
\(e/\left(-17\right)+5+8+17+\left(-3\right)\)
\(=\left(-17\right)+17+13-3\)
\(=0+10=10\)
\(f/25\cdot2^2-\left(15-18\right)+\left(12-19+10\right)\)
\(=25\cdot4-\left(-3\right)+3\)
\(=100+3+3=106\)
\(g/15^2-\left(15+9\right):2^2+3\cdot\left(4^2\right)+1\)
\(=225-24:4+3\cdot\left(16+1\right)\)
\(=225-6+3\cdot17\)
\(=219+51\)
\(=270\)
(...chắc sai...> . < ...)