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a) x : 6 = 14
x = 14 x 6
x = 84
b) x + 253 = 639
x = 639 - 253
x = 386
c) x - 29 = 56 x 3
x = 56 x 3
x = 168 + 29
x = 197
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 5760 > 5699
7849 < 8700
b) 9999 < 10001
10100 > 10080
c) 74685 = 74685
90537 > 90357
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(29 x 2 + ( 56 x 9 + ( 45 x 7 + ( 67 x 3 + ( 89 x 6 ) = (29 + 56 + 45 + 67 + 89) x (2 x 9 x 7 x 3 x 6)
= (85 + 45 + 67 + 89) x (18 x 7 x 3 x 6)
= (130 + 67 + 89) x (126 x 3 x 6)
= (197 + 89) x (378 x 6)
= 266 x 2268
= 589080
![](https://rs.olm.vn/images/avt/0.png?1311)
\(8000\times6=48000\)
\(7\times9000=63000\)
\(14000\times4=56000\)
\(3\times29000=87000\)
\(27000\times3=81000\)
\(46000\times2=92000\)
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a=(74-29) : 9
a=45 : 9
a=5
a x 9 = 74 - 29
a x 9 = 45
a = 45 : 9
a = 5