12+54:3+7+30-10=45
55:(7-2)x10-22:3+34=45
12x5:3-4x5:2+10=50
(12+54=66:3=22+7=29+30=59-10=49 ;55:(7-2)=11x5=55-22=33:3=11+34=45 ;12x5=60:3=20-4=16x5=80:2=40+10=50.Vậy thôi)
12+54:3+7+30-10=45
55:(7-2)x10-22:3+34=45
12x5:3-4x5:2+10=50
12 + 54 : 3 + 7 x 30 : 14 = 45
55 - ( 7 - 2 ) + 10 + 22 - 3 - 34 = 45
12 x 5 : 3 + 4 x 5 x 2 - 10 = 50
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