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7+3[21x3 x (7x2-4x3)+8]
Dau coroana


Răspuns :

7+3[21×3×(7×2-4×3)+8]=
=7+3[63×(14-12)+8]=
=7+3(63×2+8)=
=7+3(126+8)=
=7+3×134=
=7+402=409
7+3[21x3 x (7x2-4x3)+8]=409
=7+3x[63x(14-12)+8]=
=7+3x(63x2+8)=
=7+3x(126+8)=
=7+3x134=
=7+402=
=409