Question

Efectuaţi: a) 12 + 9,12 ⋅ 3 = b) 16 – 3 ⋅ (1,8 ⋅ 3 -2,15 ) = c) 0,3 ² + 0,2 ² - 2 ⋅ 0,3 ⋅ 0,2 = d) (4 – 1,9 ² + 1,57 ) ⋅ 0,2 ² = ​

Answer 1

Răspuns:

a ) 39 , 36

b ) 6 , 25

c ) 0 , 01

d ) 0 , 0784

Explicație pas cu pas:

a ) 12 + 9 , 12 × 3 = 39 , 36

12 + 27 , 36 = 39 , 36 ;

b ) 16 - 3 × ( 1 , 8 × 3 - 2 , 15 ) = 6 , 25

16 - 3 × ( 5 , 4 - 2 , 15 ) = 6 , 25

16 - 3 × 3 , 25 = 6 , 25

16 - 9 , 75 = 6 , 25 ;

c ) ( 0 , 3 )² + ( 0 , 2 )² - 2 × 0 , 3 × 0 , 2 = 0 , 01

0 , 09 + 0 , 04 - 0 , 6 × 0 , 2 = 0 , 01

0 , 09 + 0 , 04 - 0 , 12 = 0 , 01

0 , 13 - 0 , 12 = 0 , 01 ;

d ) ( 4 - 1 , 9² + 1 , 57 ) × ( 0 , 2 )² = 0 , 0784

( 4 - 3 , 61 + 1 , 57 ) × 0 , 04 = 0 , 0784

( 0 , 39 + 1 , 57 ) × 0 , 04 = 0 , 0784

1 , 96 × 0 , 04 = 0 , 0784.