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404 < 440 200 + 5 < 250
765 > 756 440 - 40 > 399
899 < 900 500 + 50 + 5 = 555
![](https://rs.olm.vn/images/avt/0.png?1311)
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x + 500 = 500 + 10
x + 500 = 510
x = 510 - 500
x = 10
ai k mk mk k lại ^_^
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\(2+3+8+555=568\)
\(4+5925+54251-555+56532=116157\)
\(565264+546512=1111776\)
\(51665+854785+5448559=6355009\)
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(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2.................999 x 2 x 2 x 2 ?
A.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 > 999 x 2 x 2 x 2 = 9990 > 7992
B.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 < 999 x 2 x 2 x 2 = 9990 < 7992
C.(111 + 222 + 333 + 444 + 555 + 666 + 777 + 888 + 999)x 2 = 999 x 2 x 2 x 2 = 9990 = 7992
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a, 500+500+500+(100 x 2)
=500 x 3+ 100x2
=1500+200
=1700
b, 700+300+(100 x 10)=700+300+1000=1000+1000=2000
k minh nha
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8000 + 100 + 50 + 9 = 8159
3000 + 600 + 10 + 2 = 3612
5000 + 500 + 50 + 5 = 5555
7000 + 900 + 90 + 9 = 7999
500 x10 + 555
= 5000 + 555
= 5555
500*10+5=5555