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\(1\)) \(5-\left(10-x\right)=7\)
\(10-x=5-7\)
\(10-x=-2\)
\(x=10-\left(-2\right)\)
\(x=12\)
\(2\)) \(-32-\left(x-5\right)=0\)
\(x-5=-32-0\)
\(x-5=-32\)
\(x=-32+5\)
\(x=-27\)
c: -62+x=-14+46
=>\(x-62=46-14=32\)
=>\(x=32+62=94\)
d: \(25+\left(x-5\right)=-123-\left(15-123\right)\)
=>\(x-5+25=-123-15+123\)
=>\(x+20=-15\)
=>\(x=-15-20=-35\)
25+(x-5)=123-(15-123)
=>x-5+25=123-15+123
=>x+20=246-15=231
=>x=231-20=211
a) `123 - 27 + 27 + 13 - 123`
`= (123 - 123) + (27 - 27) + 13`
`= 0 + 0 + 13`
`= 13`
`---`
b) `175 + 25 + 13 + 15 - 175 - 25`
`= (175-175)+(25-25)+25+13`
`=0+0+25+13`
`=28`
`---`
c) \(53\times39+47\times39+53\times21+47\times21\)
\(=\text{[}\left(53+47\right)\times39]+\left[\left(53+47\right)\times21\right]\)
\(=\left(100\times39\right)+\left(100\times21\right)\)
\(=3900+2100\)
`=6000`
`---`
d) \(49\times35+49\times16-49\times61\)
`=` \(49\times\left(35+16-61\right)\)
`=` \(49\times\left(-10\right)\)
`=-490`
\(25:x^5-16=3^{15}:3^{13}\)
=>\(25:x^5-16=3^2=9\)
=>\(25:x^5=25\)
=>\(x^5=1\)
=>x=1
\(25+\left(x-5\right)=-13-\left(15-123\right)\\ 25+x-5=-13-\left(-108\right)\\ 20+x=95\\ x=95-20=75\)
tham khảo
25+ (x-5)=-13-(15-123)
25+ (x-5)=13-15+123
25+ (x-5)=95
x-5=75-25
x=70+5
x=75