(3/5加2/3)乘15 , ( 2/5+2/3)*15 , 4/7*7/11+3/7 *7/11 , 5/7* 8/9+ 5/7,101*3/100怎么做求助
问题描述:
(3/5加2/3)乘15 , ( 2/5+2/3)*15 , 4/7*7/11+3/7 *7/11 , 5/7* 8/9+ 5/7,101*3/100怎么做求助
答
(3/5加2/3)乘15 =3/5x15+2/3x15=9+10=19( 2/5+2/3)*15=2/5x15+2/3x15=6+10=164/7*7/11+3/7 *7/11=(4/7+3/7)x7/11=1x7/11=7/115/7* 8/9+ 5/7=5/7x(8/9+1)=5/7x17/9=85/63101*3/100=303/100=3又3/100