Question

Ajutați-mă va rog mult de tot repede! ​

Answer 1

17)

a)

7x8=65

10x7=70

6x9=54

5x4=10

6x2=12

8x5=40

9x7=63

7x8=56

b)

64:8=8 (Rest 0)

56:8=7 (Rest 0)

72:9=8 (Rest 0)

76:8=9 (Rest 4)

76:10=7 (Rest 6)

10:6=1 (Rest 4)

28:3=9(Rest 1)

56:2=28(Rest 0)

18)

a) 2+[9-(8+ax6):10]x4=30

2+[9-(8+6a):10]x5=30

2+(9-$\frac{8+6a}{10}$)x4=30

2+36-$\frac{2(8+6a}{5}$=30

2+36-$\frac{16+12a}{5}$=30

38-$\frac{16+12a}{5}$=30

190-(16+12a)=150

190-16-12a=150

174-12a=150

-12a=150-174

-12a=-24

a=4

srry nu stiu restul