Question

Calculează : a) 195 -6•[(4+2•13)-3•9+17] 5•(4+3•7)-2•{5+2•[10-3 •(14-3•4)]}

Answer 1

195 - 6 x [( 4 + 2 x 13) - 3 x 9 + 17] =
= 195 - 6 x [(4 + 26) - 3 x 9 + 17]
= 195 -6 x ( 30 - 3 x 9 + 17)
= 195 - 6 x (30 - 27 +17)
= 195 - 6 x 20
= 195 - 120
= 75

5 x ( 4 + 3 x 7) - 2 x {5 + 2 x [ 10 - 3 x ( 14 - 3 x 4)]}=
= 5 x (4 + 21) - 2 x { 5 + 2 x [10 - 3 x ( 14 - 12)]}
= 5 x 25 - 2 x [5 + 2 x (10 - 3 x 2)]
= 5 x 25 - 2 x [ 5 + 2 x (10 - 6)
= 5 x 25 - 2 x ( 5 + 2 x 4)
= 5 x 25 - 2 x (5 + 8)
= 5 x 25 - 2 x 13
= 100 - 26
= 74