1.(1-1/2+1/3)+(1/2-1/3-1/4)2.39又65/68*173.(1又2/3+6又3/8+2又1/3+3又3/8)*(1-9/14)4.3.25*1.28*0.25/(1又7/25*1/4*3又1/4)5.8又4/5÷【87+0.625*(2又3/4-1.15)】6.(3/4-3/4*2/5)/1/5*5
问题描述:
1.(1-1/2+1/3)+(1/2-1/3-1/4)
2.39又65/68*17
3.(1又2/3+6又3/8+2又1/3+3又3/8)*(1-9/14)
4.3.25*1.28*0.25/(1又7/25*1/4*3又1/4)
5.8又4/5÷【87+0.625*(2又3/4-1.15)】
6.(3/4-3/4*2/5)/1/5*5
答
1.(1-1/2+1/3)+(1/2-1/3-1/4)
=(1/2+1/3)+(3/6-2/6-1/4)
=5/6+1/6-1/4
=1-1/4
=3/4
2.39又65/68*17
=65*39/68*17
=65*39/4
=2535/4
=633又3/4