Question

4. Calculează in 2 moduri:
(36+30):3 =
(46+22):2=
5. Afla nr necunoscut
7x9-a=50
mx6+17=65
100-(3xn+5×5)=45
ajutati-ma va rog

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Answer 1

Explicație pas cu pas:

Ex 4.

Mod 1.

(36+30):3=66:3=22

Mod 2.

36:3+30:3=12+10=22

Mod 1.

(46+22):2=68:2=34

Mod 2.

46:2+22:2=23+11=34

Ex 5.

7×9-a=50

63-a=50

a=63-50

a=13

v:7×9-13=63-13=50

m×6+17=65

m×6=65-17

m×6=48

m=48:6

m=8

v:8×6+17=48+17=65

100-(3×n+5×5)=45

100-(3×n+25)=45

3xn=100-45-25

3×n=55-25

3xn=30

n=30:3

n=10

v:100-(3×10+5×5)=

100-(30+25)=

100-55=

45