3543+3483
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\(x.7+456.3+x.2=3483\)
\(x\left(7+2\right)+1368=3483\)
\(9x=2115\)
\(x=235\)
x . 7 + 456 . 3 + x . 2 = 3483
x . ( 7 + 2 ) + 1368 = 3483
x . 9 + 1368 = 3483
x . 9 = 3483 - 1368
x . 9 = 2115
x = 2115 : 9
x = 235


6249 + 3543 + 4534 + 1354
= 9792 + 4534 + 1354
= 14326 + 1354
= 15680

Đúng:100 coin
Sai 1 câu:80 coin
Sai 2 câu:60 coin
Sai 3 câu :40 coin
Sai 4 câu:0 coin


(454756-34345+7665).(7342342-865345+754343).(243432-563454-34324+343+354).(34324-4235-4354-655+53432).(32543252-5435+544+35421+456).(435-6543-3455+35635+54).(34+43+6556543+4-5325-354).(345-3464-76576+3542425).(324-65-3335+4353532).(3545-334-1333+897+654).(12563-3487-7653+9854).(43245-3324-543+3443+3423+3454).(63466-5353-6346+5252+35636+532523).(324-436+45546+3242).(98350-980324-3565646+45634+34526).(3458453+863-3458453-863).(23454234-54345+4523+3543).(344+342+45435-3535542).3423423.(24342342-1423+2452422-35224).(64645-3242-34523-56+523452).(2134232-23422-3432-222+35423).(4564363-435634+3524+2352+245345).(324253252-24232+24353542+3242).(32424535-3633+2141431+3252343).(53534+353-5345432-4532).(343245+345-5423).(54252-3242+35355-2342).(32422-54534-543+252+353425) =0
7026
3543 + 3483 = 7026