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Ramonamario76
a fost răspuns

1) 27:a+(63:9+8)=18 2) 9×b+3×7-20:2=56 3) 99-(8×2+5×3)+6×5= 4) 42+(8-6)×8+(15-12):3=
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Răspuns :

Orhideea88

Răspuns:

Buna!

a) 27:a + (63:9 +8) =18

   27: a+ (7+8) =18

   27:a+15=18

   27:a=18-15

   27:a=3

   a= 27:3

   a=9

b) 9*b + 3*7 - 20:2=56

    9*b+21-10=56

    9*b+11=56

    9*b = 56-11

    9*b=45

    b= 45:9

    b=5

c) 99 - (8*2+5*3)+6*5=

=99- (16+15)+30

=99- 31 +30

=68+30

=98

d) 42+ (8-6)*8+(15-12):3

=42 +2*8 + 3:3

=42 +16+1

=58+1

=59

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