Question

Calculati. a) 208+2027-145 b)( 122+ 436)-(61+56) c) 957-421+327 d) 2+4+6+.... +20

Answer 1

a) 208 + 2027 - 145

2235 - 145 = 2090

b) (122 + 436) - (61 + 56)

558 - 117 = 441

c) 957 - 421 + 327 = 863

d) 2+4+6+...20

2*(1+2+3+...+10)

2*[(10*11)/2]

2*(5*11)

2*55 = 110

Answer 2

Răspuns:

208+2027-145=2090

(122+436)-(61+56)=558-117=441

957-421+327=863

2(1+2+3+...+10)=2((10x11):2)=2x55=110

Explicație pas cu pas: