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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính
A=12.194+6.437.2+3.369.4
B=1+5+9+13+...+57+61+65.2-26
Giải:A=12.194 + 6.2.437 + 3.4.369
=12.194+12.437+12.369
=12.(194+437+369)
=12.1000=12000
B=1+5+..............+57+61+65.2-26
=(1+61)+(5+57)+...........+(29+33) + 130-26
=62+62+...........+62+104
=62 x 8 + 104
=496+104=600
Vậy................
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: *12.194+6.437.2+3.369.4
=12.194+12.437+12.369
=12(194+437+369)
=12.1000
=12000
*1+5+9+13+…+57+61+65.2-26
=(1+61)+(5+57)+…+(29+33)+130-26
=62.8+130-26
= (496-26)+130
=470+130=600
\(\Rightarrow A=\frac{12000}{600}=20\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(56\cdot125=56\cdot100+56\cdot25=5600+1400=7000\)
b: \(13\cdot12=\left(10+3\right)\cdot12=120+36=156\)
c: \(39\cdot101=39\cdot100+39=3939\)
d: \(12\cdot53+53\cdot172-53\cdot84\)
=53(12+172-84)
=53*100
=5300
e: \(5\cdot7\cdot77-7\cdot60+49\cdot25-15\cdot42\)
\(=5\cdot7\left(77+7\cdot5\right)-420-630\)
\(=35\cdot112-1050=2870\)
\(=\frac{11612544}{685}\)
\(=16952,61898\)