Question

9. Efectuează, ținând cont de ordinea efect
98 - (7 x 3 + 12) + 5 x 3 =
56 + (54 : 9 x 2) – 6 x 7 =
4 x (24 : 3 – 4) + (64: 8:4 + 6) x 2 =
9 x (1 + 49 : 7 : 7) – 16: 8 x (5 – 6:2)

Answer 1

98-(7x3+12)+5x3=
=98-(21+12)+15
=98-33+15
=65+15
=80

56+(54:9x2)-6x7=
=56+(6x2)-42
=56+12-42
=68-42
=24

4x(24:3-4)+(64:8:4+6)x2=
=4x(8-4)+(8:4+6)x2
=4x4+(2+6)x2
=16+8x2
=16+16
=32

9x(1+49:7:7)-16:8x(5-6:2)=
=9x(1+7:7)-2x(5-3)
=9x(1+1)-2x2
=9x2-4
=18-4
=14