17. Nu rata performanţa şi calculează:
a) 12-9,12:3=
b) 4-3,15:2=
c) (4,9:7+3,8).2-7,8=
d) 16,25:0,5-23,04=
e) 16-3. (18,9:12 +1,2) =
f) 16,5:0,6 15,21 =
g) 2,079:0,18-2,5.3,2=
h) (23,04-3,8.5,6) :0,4+4,84 =
i) (4,32:1,44-2,56) : 0,04-10,24 =
j) (5,76 :0,04-125,44): 0,4-44,89= ​

Explicație pas cu pas:

a) 12-9,12:3 = 12 - 9.12 ÷ 3 = 12 - 3.04 = 8.96

b) 4-3,15:2 = 4 - 3.15 ÷ 2 = 4 - 1.575 = 2.425

c) (4,9:7+3,8).2-7,8 = (0.7 + 3.8) * 2 - 7.8 = 4.5 * 2 - 7.8 = 9 - 7.8 = 1.2

d) 16,25:0,5-23,04 = 16.25 ÷ 0.5 - 23.04 = 32.5 - 23.04 = 9.46

e) 16-3. (18,9:12 + 1,2) = 16 - 3 * (18.9 ÷ 12 + 1.2) = 16 - 3 * (1.575 + 1.2) = 16 - 3 * 2.775 = 16 - 8.325 = 7.675

f) 16,5:0,6 15,21 = 16.5 ÷ 0.6 - 15.21 = 27.5 - 15.21 = 12.29

g) 2,079:0,18-2,5.3,2 = 2.079 ÷ 0.18 - 2.5 * 3.2 = 11.55 - 8 = 3.55

h) (23,04-3,8.5,6) :0,4+4,84 = (23.04 - 3.8 * 5.6) ÷ 0.4 + 4.84 = (23.04 - 21.28) ÷ 0.4 + 4.84 = 1.76 ÷ 0.4 + 4.84 = 4.4 + 4.84 = 9.24

i) (4,32:1,44-2,56) : 0,04-10,24 = (4.32 ÷ 1.44 - 2.56) ÷ 0