Question

Afla numerele necunoscute: 7×3-a=14 8×4 +x=49. 2×9+b=61. C+4-8=21

Answer 1

Răspuns:

7x3-a=14

21-a=14

A=21-14

A=7

8x4+x=49

32+x=49

X=49-32

X=17

2x9+b=61

18+b=61

B=61-18

B=43

C+4-8=21

C+4=21+8

C+4=29

C=29-4

C=25

Answer 2

Explicație pas cu pas:

7×3-a=14

21-a=14

a=21-14

a=7

v:7×3-7=21-7=14

8×4+x=49

32+x=49

x=49-32

x=17

v:8×4+17=32+17=49

2×9+b=61

18+b=61

b=61-18

b=43

v:2×9+43=18+43=61

c+4-8=21

c-4=21

c=21+4

c=25

v:25+4-8=29-8=21