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Efectuati:98-7x{6+5x[4-3x(2-1)]}.Va rog frumos.Multumesc.

Răspuns :

98-7×{6+5×[4-3×(2-1)]}=
98-7×{6+5×[4-3×1]}=
98-7×{6+5×[4-3]}=
98 - 7x{6+5x[4-3x(2-1)]}=98-7x{6+5x[4-3x1]}=98-7x{6+5x[4-3]}=98-7x{6+5x1}=98-7x11=98-77=21