【(1又1/2+2又2/3)÷3又3/4-2/5】÷8又8/9+1/4
2又1/2+0.309÷【1/20×(2.31÷0.077)】-2.526
(1+1/5)×【82÷(2又1/2-7/3)+11】×(1/5-1/6)
ãï¼1å1/2+2å2/3)÷3å3/4-2/5ã÷8å8/9+1/4
=[(3/2+8/3)÷15/4-2/5]÷80/9+1/4
=[(3/2Ã4/15+8/3Ã4/15)-2/5]Ã9/80+1/4
=(2/5+32/45-2/5)Ã9/80+1/4
=32/45Ã9/80+1/4
=2/25+1/4
=33/100
2å1/2+0.309÷ã1/20Ãï¼2.31÷0.077ï¼ã-2.526
=2.5+0.309÷(1/20Ã30)-2.526
=2.5+0.309Ã2/3-2.526
=2.5+0.206-2.526
=0.18
ï¼1+1/5)Ãã82÷ï¼2å1/2-7/3)+11ãÃï¼1/5-1/6)
=6/5Ã(82÷1/6+11)Ã1/30
=6/5Ã1/30Ã(492+11)
=1/25Ã503
=503/25