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Lời giải:
$101+x\times 7-6=101+2\times x$
$x\times 7-6=2\times x$
$x\times 7-2\times x=6$
$5\times x=6$
$x=\frac{6}{5}$
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a) 125.3+125.125.6
=125.3+125.750
=125.(3+750)
=125.753
=94125
b) (245.99+245)-(145.101-145)
=(245.(99+1))-(145.(101-1))
=245.100-145.100
=(245-145).100
=100.100
=10000
c) 154.(28+52)-45.(26+54)
=154.80-45.80
=(154-45).80
=109.80
=8720
a) 125x3+125+125x6
=125x(3+1+6)
=125x10
=1250
b) (245x99+245)-(145x101-145)
=(245x99+245)-(145x100)
=(245x100)-14500
=24500-14500
10000
c) 154x80-45x80
=80x(145-45)
=80x100
=8000
![](https://rs.olm.vn/images/avt/0.png?1311)
x * 101 - x = 72000
x * 101 - x * 1 = 72000
x * ( 101 - 1 ) = 72000
x * 100 = 72000
x = 72000 : 100
x = 720
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a) X : 8 = 101
X = 101 x 8
X = 808
b) X : 5 = 117
X = 117 x 5
X = 585
c) X : 3 = 282
X = 282 x 3
X = 846
x + 1 = 101
x = 101 - 1
x = 100
tk mik nha bn
x + 1 = 101
x = 101 - 1
x = 100