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\(45.x-9.x+x+63.x=54000\\ x.\left(45-9+1+63\right)=5400\\ x.100=54000\\ x=54000:100\\ x=540\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
a.
$18\times 85+9\times 30=18\times 85+18\times 15=18\times (85+15)$
$=18\times 100=1800$
b.
$9\times 13+9\times 80+63=9\times 13+9\times 80+9\times 7$
$=9\times (13+80+7)=9\times 100=900$
c.
$8\times 11+16\times 40+72=8\times 11+8\times 80+8\times 9$
$=8\times (11+80+9)=8\times 100=800$
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.18\times85+9\times30\)
\(\text{=}1530+270\)
\(\text{=}1800\)
\(b.9\times13+9\times80+63\)
\(\text{=}117+720+63\)
\(\text{=}900\)
\(c.8\times11+16\times40+72\)
\(\text{=}88+640+72\)
\(\text{=}800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(4\times378\times25\)
\(=\left(25\times4\right)\times378\)
\(=100\times378\)
\(=37800\)
b) \(214\times53-214\times45\)
\(=214\times\left(53-45\right)\)
\(=214\times8\)
\(=1712\)
a) \(4\times378\times25\)
\(=4\times25\times378\)
\(=100\times378\)
\(=37800\)
b) \(214\times53-214\times45\)
\(=214\times\left(53-45\right)\)
\(=214\times8\)
\(=1712\) ( Thuận tiện chỗ nào? )
99xX=54000
x=545.(45)