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x * 3 : 8 - 1912 = 7778
x * 3 : 8 = 7778 + 1912
x * 3 : 8 = 9690
x * 3 = 9690 * 8
x * 3 = 77520
x = 77520 : 3
x = 25840
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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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\(\text{555 + 999 + 777 = ?}\)
\(\text{Trả lời :}\)
\(\text{555 + 999 + 777 = 2331}\)
\(\text{Chúc bạn học tốt !}\)
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886675221
7778+7878787+878787878+777+1=886675221
k nha!