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beid
a + (43 - 27) = 52
63 - 49 + a = 71
91-36-a = 27
a - (18-9) = 16​


Răspuns :

■a+(43-27)=52

a+16=52

a=52-16

a=36

■63-49+a=71

14+a=71

a=71-14

a=57

■91-36-a=27

55-a=27

a=55-27

a=28

■a-(18-9)=16

a-9=16

a=16+9

a=25

a + ( 43 - 27 ) = 52

a + 16 = 52

a = 52 - 16

a = 36

63 - 49 + a = 71

14 + a = 71

a = 71 - 14

a = 57

91 - 36 - a = 27

55 - a = 27

a = 55 - 27

a = 28

a - ( 18 - 9 ) = 16

a - 9 = 16

a = 16 + 9

a = 25