简算:73*64+73*35+73,124*49-24*49.计算:1+3+5+……+95+97+99
问题描述:
简算:73*64+73*35+73,124*49-24*49.计算:1+3+5+……+95+97+99
答
73*64+73*35+73
=73*(64+35+1)
=73*100
=7300
124*49-24*49
=(124-24)*49
=100*49
=4900
1+3+5+……+95+97+99
=50×50
=2500