2.10^7+2.10^6+10^5.2.10^4.10^3+9.10^2+40.10+4
=20000000+2000000+100000+20000+1000+900+40+4
=22121944
2.10^7+2.10^6+10^5.2.10^4.10^3+9.10^2+40.10+4
=20000000+2000000+100000+20000+1000+900+40+4
=22121944
1+2-3-4+5+6-7-8+9+.......+101+102-103-104+105
1-2-3+4+5-6-7+8+..+100+101-102-103+104+105
315-x /101 +313-x /103 +311-x /105 +309-x /107 =-4. Tim x
CMR:1+2-3-4+5+6-7-8+...+101+102-103-104+105=1
Tính:
1-2-3+4+5-6-7+8+.....+101-102-103+104+105
Tìm số tự nhiên x biết:
a, 71.2 – 6.(2x+5) = 10 5 : 10 3
b, 5 x + 3 4 . 6 8 = 6 9 . 3 4
c, 12:{390:[5. 10 2 – ( 5 3 + x . 7 2 )]} = 4
d, 5 3 .(3x+2):13 = 10 3 : 13 5 : 13 4
Tính :
1-2-3+4+5-6-7+ ... + 102-103+104+105
Tính nhanh:
106+105-104-103+102+101-100-99+...+6+5-4-3+2+1
a)
101+103+105+...+201
b)
(-1)+2+3+4-%+6-...-99+100
Tính:
a)2.103+6.102+0.10+1=
b)5.104+7.103+9.102+1.10+5=