Question

Afla valoarea lui a:
a) 27:[26+(6xA-7x3):9]+(13-2x2x3)=2
b) 5+[16-(9:Ax8+7]x6=4:(1x2)+(3x3)

Answer 1

a)27:[26+(6A-7×3):9]+(13-2×2×3)=2 27:[26+(6A-21):9]=2-1=1 26+(6a-21):9]=1×27=27 26+(6a-21)=27×9=243 6a-21=243-26=217 6a=217+21=238 6a=238 a=238:6=39,(6) b)5+[16-(9:a×8+7)]×6=11 [16-(9:a×8+7)]×6=11-5=6 16-(9:a×8+7)=6:6=1 9:a×8+7=1+16=17 9:a×8=17-7=10 9:a=10 a=10×9 a=90