Question

calculați a) 5+[10-3 *(4-2)] ; b) [2+4 *(-3)] *5; c) 2+2*[3+3 *(10-1)]; d)475+2*[45+2 *(400-298)] ; steluță înseamnă x

Answer 1

a.  5 + [ 10 - 3 * ( 4 - 2 ) ] = 5 + [ 10 - 3 * 2 ] = 5 + ( 10 - 6 ) =  5 + 4 = 9

b.  [ 2 + 4 *( - 3 ) ] * 5 = [ 2 - 12 ] * 5 = - 10 * 5 = - 50

c.  2 + 2 * [ 3 + 3 * ( 10 - 1 ) ] =  2 + 2 * ( 3 + 3 * 9 ) = 2 + 2 * ( 3 + 27 ) = 2 + 2 * 30 = 2 + 60 = 62

d.  475 + 2 * [ 45 + 2 * ( 400 - 298 ) ] = 475 + 2 * ( 45 + 2 * 102 ) = 475 + 2 * ( 45 + 204 ) = 475 + 2 * 249 = 475 + 498 = 973