Question

найти числовое значение выражения

Answer 1

1.
При  z = -3/4; t=1/2 получаем

1) (z+3t)·t - z² = ((-3/4)+3·(1/2))·(1/2) - (-3/4)²=((-3/4)+3/2)·(1/2) - (9/16) =
     =(3/4)·(1/2) - (9/16) = (3/8) - (9/16) = (6/16) - (9/16) =  - 3/16.

2) z³ + z·(2z+t) - t² = (-3/4)³ - (3/4)·(-3/2+1/2) - 1/4 = 
   = (-27/64)  - (3/4)·(-1) - 1/4 = (-27/64) + (3/4) - (1/4) = (-27/64) + (1/2)=
  = (-27/64) + (32/64) = 5/64.

3) (-3/16) : (5/64) = (-3)·64/(16)·5 = - 12/5 = -2,4.

2.
При  х=0,4;  у=0,3
получаем

√(х+у²) = √(0,4+ 0,3²) = √(0,4+0,09) = √0,49 = 0,7.