Matematică, întrebare adresată de ssimona38, 9 ani în urmă

1. Mihai si Robert au colectionat  timbre .Mihai a pus in clasor cate 7 timbre pe 8 pagini,iar Robert a pus cate 8 timbre pe 7 pagini.Cate timbre  trebuie sa mai colectioneze fiecare baiat pentru a avea cate 100 de timbre? ( plan de rezolvare)

2.Afla produsul dintre numarul 8 si suma urmatoarelor perechi de numere;
 a)  6 si 3;
 b) 5 si 3;
c)   3 si 4 
d) 6 si 4 ;
 
3. Completeaza  casetele cu numere potrivite pentru a obtine propozitii adevarate ;
 a )  5 x 2 x 4 =  casuta x 8
      2 x 5 x casuta =10 x  casuta;
b) 2 x 2 x 7 = 2x casuta 
    2 x 6 x 2 = casuta x8 ;
c) 2 x 4 x casuta = 48
   3 x casuta x3 = 72 

4.Din produsul numerelor 8 si 9 scade produsul numerelor 6 si 9


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lidia8: MariiaAlexandraa
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Răspunsuri la întrebare

Răspuns de GabrielaPop55
2
ex.1
1.Cate timbre are Mihai?
7x8=56 timbre
2. Cate timbre ii mai trebuie lui Mihai pentru a avea 100 timbre?
100-56=44 timbre
3.Cate timbre are Robert?
8x7=56 timbre
2. Cate timbre ii mai trebuie lui Robert pentru a avea 100 timbre?
100-56=44
(Amandoi au acelasi nr de timbre)
 R: -Mihai:44 timbre
     -Robert: 44 timbre

ex.2
a) 8x(6+3)=8x9=72
b) 8x(5+3)=8x8=64
c) 8x(3+4)=8x7=56
d) 8x(6+4)=8x10=80

ex.3
a)5x2x4=5x8
  2x5x6 =10x6 (aici ai o infinitate de variante pt casute..daca nu ai o regula care spune cate cifre trebuie sa aiba nr sau ceva in genul..)
b) 2x2x7=2x14
   2x6x2=3x8
c)2x4x6=48
   3x8x3=72

ex.4
8x9-6x9=72-54=18

Sper ca te-am ajutat!
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