Question

Testul 3 matematica rezolvat urgent 100 puncte​

Answer 1

Răspuns:

1) 1251+107-238=1358-238=1120

1+2+3+....+19=19·20/2=190

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2) 102- cel mai mic nr de 3 cifre distincte

98- cel mai mare nr de 2 cifre distincte

102+98=200

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3) a+b-c=(1957+234)+(1989-43)-(22+147)=2191+1946-169=3968

a-b+c=(1957+234)-(1989-43)+(22+147)=2191-1946+169=414

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4) a+7+b=37=>a+b=37-7=>a+b=30

(a+b)+5=30+5=35

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

47-(a+b)=47-30=17

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5) a+b+a-b=160

2a=160=>a=80

b= 0, 1, 2, 3..., 80

81 solutii are problema

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6) 16,61,25,52,34,43,70