(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

Đáp án A nhé

(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

= 4995

4995 nha

`=111 xx (1+2+3+...+9) + (1001+1003+1005)`

`=111 xx 45 + 3009`

`=4995 +3009`

`=8004`

 111 + 333 + 666 + 777 +999 +444 + 555 +222

=(111+999) + (333+777) + (666 + 444) +(555+ 222)

=1110 + 1110+1110 + 777

=1110 * 3 + 777

= 3330+ 777=4107

= 4885 nha tk mk nhé , xin bn lun đó

111 + 333 + 888 + 666 + 777 + 999 + 444 + 555 + 222 = 4995

bằng 4995 nha

\(999+888+777+666+555+444+333+222+111\)

\(=\left(999+111\right)+\left(888+222\right)+\left(777+333\right)+\left(666+444\right)+555\)

\(=1110+1110+1110+1110+555\)

\(=\left(1110\times4\right)+555\)

\(=4440+555\)

\(=4995\)

=(999+111)+(888+222)+(777+333)+(666+444)+555

=1110+1110+1110+1110+555

=1110 x 4 +555

=4440+555

=4995

555+666+333+222+111+999+000+888+777+444=4995

hok tot

555+666+333+222+111+999+000+888+777+444=4995

=4995

doi tk nha

\(111+999=1110\)

\(222+333=555\)

\(406+903=1309\)

\(102+870=972\)

\(784+655=1439\)

\(232+980=1212\)

#Wendy Dang