Question

C = 98+96+94+......+4+2-97-95-93-......-3

Các bạn ơi giúp mình với , cảm ơn nhiều 

 

Answer 1

C = 98 + 96 + 94 + .. + 4 + 2 - 97 - 95 - 93 - .. - 3

    = (98 + 96 + 94 + ... + 4 + 2) - (97 + 95 + 93 + ... + 3)

    = 49 . 100 : 2 - 48.100 : 2

    = 49.50 - 48.50

    = 50.(49 - 48)

    = 50 . 1

    = 50

Vậy C = 50

Answer 2

\(C=98+96+94+...+4+2-97-95-93-...-3\)

\(=\left(98+2\right).49:2-\left(97+95+93+...+3\right)\)

\(=49.50-\left(97+3\right).48:2=49.50+48.50=\left(49+48\right).50=97.50=4850\)

Answer 3

ơ mình nhầm 

\(=\left(49-48\right)50=50\)

nha bạn

Answer 4

\(C=98+96+94+...+4+2-97-95-93-...-3\)

\(=\left(98+96+94+...+4+2\right)-\left(97+95+93+...+3\right)\)

\(=49.100:2-48.100:2\)

\(=49.50-48.50\)

\(=50.\left(49-48\right)\)

\(=50.1\)

\(=50\)