做功課啊！急急急！

(1+100)*50=5050

(100+1)×50

=5050

(1+100)X50
=5500

(1+100)/100分2
=101/100分2
=5050

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+55+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70+71+72+73+74+75+76+78+79+80+81+82+83+84+85+86+87+88+89+90+91+92+93+94+95+96+97+98+99+100=5050

(1+100)X50=5050

(1+100)x50
=5050

Frist , you can + 1 to do the qustion!!!

(1+100)x(100/2)=5050

(1 + 100) x 100 / 2 = 101 x 100 / 2 = 5050