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................

Ko phai day la so tren gach ngang so duoi

neu muon thi rut gon A/B

1)=12.194+12.437+12.369

   =12.(194+437+369)

   =12.1000

=12000

1)

con lé kia

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
\(\Rightarrow A=\frac{12000}{600}=20\)

1)12.194+6.437.2+3,369.4=12.194+12.437+12,369=12.(194+437+369)=12x1000=12000

2)1+5+9+13+........+57+61+65.2-26

3)8.9.14+6.17.12+19.4.18=72x14+72x17+19.72=72x(14+17+19)=72x50=3600

4)1+2-3-4-5+6-7-8+9+994-995-996+997+998

5)1994.19931993-1993.19941994=0

nhanh lên gấp lắm .nhanh lên nhen

1) 12000

3) 3600

5)0

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: \(5\cdot7\cdot77-7\cdot60+49\cdot25-15\cdot42\)

\(=5\cdot7\left(77+7\cdot5\right)-420-630\)

\(=35\cdot112-1050=2870\)