Question

a+7+b=37
A) (a+b)+5=?
B) a+(b+11)=?
C) 47-(a+b=?

Answer 1

A+b=37-7=30
A) 30+5=35
B) 30+11=41
C)47-30=17

Answer 2

Răspuns:

Explicație pas cu pas:

a + 7 + b = 37

a + b = 37 - 7

a + b = 30

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a)   ( a + b ) + 5 = 30 + 5 = 35

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b)  a + ( b + 11 ) = ( a + b ) + 11 = 30 + 11 = 41

        => folosesc asociativitatea ( ca proprietate a adunarii )

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c)    47 - ( a + b ) = 47 - 30 = 17