Question

Ex 4. , Ex5 Ex 6 Ex7 Ex 8 ​

Answer 1

Răspuns:

4.

$17 + 9 \times 3 + 2 \times (27 - 5 \times 5) - 3 \times (42 - 7 \times 5) = \\ 17 + 27 + 2 \times (27 - 25) - 3 \times (42 - 35) = \\ 44 + 2 \times 2 - 3 \times 7 = \\ 44 + 4 - 21 = \\ 48 - 21 = 27$

5.

$(2 + 8) \div 5 \times 8 - 10 = 6$

6.

$2 + 8 \div 4 - 2$

Answer 2

7. 99-4•6-40:5=
99-24-9=
75-9=
66

8. 21-64:8=
21-8=
13