Question

Daca 1 plus 2 plus 3 plus 11 egal a și 9 plus 110 plus 11 plus 18 egal b atunci calculați a plus b ​

Answer 1

1+2+3+...+11=a

9+10+11+...+18=b

a+b=?

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a=11×12÷2

a=11×6

a=66

1+8+2+8+3+8+...+10+8=b

(1+2+3+...+10)+8×10=b

10×11÷2+80=b

55+80=b

b=80+55

b=135

a+b=?

a+b=135+66=201