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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
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................
M = 1 + (2 - 3 - 4 + 50 + .... + (994 - 995 - 996 + 997 ) + 998
M = 0 + 0 + .... + 0 + 1 + 998 = 999
1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + ... + 994 - 995 - 996 + 997 + 998
= 1 + (2 - 3 - 4 + 5) + (6 - 7 - 8 + 9) + ... + (994 - 995 - 996 + 997) + 998
= 1 + 0 + 0 + .... + 0 + 998
= 1 + 998
= 999
\(A=1-2-3+4+5-6-7+8...+993-994-995+996+997\)
\(A=\left(1-2-3+4\right)+\left(5-6-7+8\right)...+\left(993-994-995+996\right)+997\)
\(A=0+0+...+0+997=997\)
C=1+2-3-4+5+6-7-8+9+...+994-995-996+997+998
C=1+(2-3-4+5)+(6-7-8+9)+...+(994-995-996+997)+998
C = 1+0+0+...+0+998
C = 999
1+2-3-4+5+6-7-8+9+...+994-995-996+997+998
=(2-3-4+5)+...+(994-995-996+997)+998+1
=0+...+0+999=999
1)=12.194+12.437+12.369
=12.(194+437+369)
=12.1000
=12000
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