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Rebeca451
a fost răspuns

194x3+200-a=493; ,(104x4+83x5)-ax3=8x100+36:9; (138x5-21:7-300x2)-9x9-rx2=2;(9x9-6x6-a)+(13+28:4)=5x10+3 ; (6 x4:3+c):7=16:4;24:4x(100:10)+5x8-6:6<90:3:3+3x7 ; (14+15+16):(19-14)>(1+2x3x4):(6-6:6).