Question

Calculați:
0,2 [0,4(6)+9/20 -1,1(6)]+0,8=



!!!!!!!cine știe că rog frumos!!!!!!!!​

Answer 1

Răspuns:

3/4 = 0,75

Explicație pas cu pas:

0,2 [0,4(6)+9/20 -1,1(6)]+0,8=

= 2/10 ·[(46-4)/90 + 9/20 - (116-11)/90] +8/10 =

= 2/10 ·[42/90 + 9/20 - 105/90] + 8/10 =

= 2/10 ·[( 42-105)/90 + 9/20] +8/10 =

= 2/10 ·(9/20 - 63/90⁽⁹) +8/10=

= 2/10·(9/20 - ²⁾7/10) +8/10 =

= 2/10·(9/20 - 14/20) +8/10 =

= 2/10·(-5/20) +8/10 =

= 2/10 ·(-1/4) +8/10 =

= -2/40⁽² + ²⁾8/10 =

= -1/20 + 16/20 =

= 15/20⁽⁵ = 3/4