Question

Ex 4 repede sunt la teme

Answer 1

4 )

a) ( 18 + 2 × 7 ) : ( 12 : 2 + 8 : 4 ) = 4

= ( 18 + 14 ) : ( 6 + 2 ) =

= 32 : 8 =

= 4

__________

b)

24 - 24 : 3 × ( 72 : 9 - 2 × 3 ) : 4 × 5 = 4

= 24 - 8 × ( 8 - 6 ) : 4 × 5 =

= 24 - 8 × 2 : 4 × 5 =

= 24 - 16 : 4 × 5 =

= 24 - 4 × 5 =

= 24 - 20 =

= 4

_______

c)

36 : 6 + 4 × 2 × 5 - ( 20 - 12 : 3 ) = 30

= 6 + 8 × 5 - ( 20 - 4 ) =

= 6 + 40 - 16 =

= 46 - 16 =

= 30

_________

d)

42 : 7 + ( 6 + 6 ) : 2 - 24 : ( 5 + 3 ) = 9

= 6 + 12 : 2 - 24 : 8 =

= 6 + 6 - 3

= 12 - 3 =

= 9

________

e)

( 25 + 20 ) : 5 - ( 19 + 5 ) : 8 = 6

= 45 : 5 - 24 : 8 =

= 9 - 3 =

= 6

_________

f)

10 + ( 10 : 10 + 10 ) - ( 10 × 1 + 10 ) = 1

= 10 + ( 1 + 10 ) - ( 10 + 10 ) =

= 10 + 11 - 20 =

= 21 - 20 =

= 1

Answer 2

a)

(18+2×7):(12:2+8:4)=

(18+14):(12:2+8:4)=

32:(12:2+8:4)=

32:(6+8:4)=

32:(6+2)=

32:8=4

b)

24-24:3×(72:9-2×3):4×5=

24-24:3×(8-2×3):4×5=

24-24:3×(8-6):4×5=

24-24:3×2:4×5=

24-4×5=

24-20=4

c)

36:6+4×2×5-(20-12:3)=

36:6+4×2×5-(20-4)=

36:6+4×2×5-16=

6+4×2×5-16=

6+40-16=46-16=30

d)

42:7+(6+6):2-24:(5+3)=

42:7+12:2-24:(5+3)=

42:7+12+2-24:8=

6+6-3=12-3=9

e)

(25+20):5-(19+5):8=

45:5-(19+5):8=

45:5-24:8=

9-3=6

f)

10+(10:10+10)-(10×1+10)=

10+1+10-(10×1+10)=

10+1+10-(10+10)=

10+1+10-20=21-20=1