23x7-y:18=106
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23 x 7 + 5
= 161 + 5
= 166
ủng hộ mk nha mọi người
cảm ơn trước
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\(12-14-16+18-20-22+...+102-104-106\\ =\left(12-14-16\right)+\left(18-20-22\right)+...+\left(102-104-106\right)\\ =-18+\left(-24\right)+\left(-30\right)+...+\left(-108\right)\\ =16.\left[-18+\left(-108\right)\right]:2\\ =16.\left(-126\right):2\\ =-2016:2\\ =-1008\)
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a: \(\left(2345+45\right)-2345\)
\(=2345+45-2345\)
\(=45+\left(2345-2345\right)\)
=45+0
=45
b: \(\left(-2010\right)-\left(119-2010\right)\)
\(=-2010-119+2010\)
\(=\left(-2010+2010\right)-119\)
=0-119
=-119
c: \(\left(18+29\right)+\left(158-18-29\right)\)
\(=18+29+158-18-29\)
\(=158+\left(18-18\right)+\left(29-29\right)\)
=158+0+0
=158
d: \(126+\left(-20\right)+2004+\left(-106\right)\)
\(=126-20+2004-106\)
\(=\left(126-20-106\right)+2004\)
=0+2004
=2004
e: \(\left(-199\right)+\left(-200\right)+\left(201\right)\)
\(=-199-200+201\)
\(=-199+\left(201-200\right)\)
=-199+1
=-198
f: \(99+\left(-100\right)+101\)
\(=\left(99+101\right)-100\)
=200-100
=100
g: \(217+\left[43+\left(-217\right)+\left(-23\right)\right]\)
\(=217+43-217-23\)
\(=\left(217-217\right)+\left(43-23\right)\)
=0+20
=20
23 x 7 - y : 18 = 106
161 - y :18 = 106
y : 18 = 161 - 106
y : 18 = 55
y = 990
33x7-y:18=106
161-y:18=106
y:18=161-106
y:18=54
y =54x18
y =972