①、1又1/8+(5又1/2-0.35)×0.4
解,得:
==(9/8)+(5.5-0.35)*0.4
==1.125+5.5*0.4-0.35*0.4
==1.125+2.2-0.14
==3.45-0.14
==3.31
②、1.5+(7又3/5-2.6)×1又1/2+(3-1又1/2)×94
解,得:
==1.5+(7.6-2.6)*1.5+(3-1.5)*94
==1.5*(1+5+1)*94
==1.5*7*94
==10.5*(100-6)
==1050-63
==987
③、7.8÷【1.6×(1-3/8)+6.8】
解,得:
==7.8÷【1.6×0.625+6.8】
==7.8÷【1+6.8】
==7.8÷7.8
==1
④、1.4+(3/8-0.25)÷1又1/4
解,得:
==1.4+(3/8-0.25)÷1.25
==1.4+0.125÷1.25
==1.4+0.1
==1.5
⑤、1.4×3又2/9-1又2/5×2又2/9
解,得:
==(7/5)*(29/9)-(7/5)*(20/9)
==(7/5)*[(29/9)-(20/9)]
==(7/5)*1
==7/5
⑥、(8/15+0.45×2/3)÷2又1/12
解,得:
==[(8/15)+(9/20)×(2/3)]÷(25/2)
==[(8/15)+(3/10)]*(2/25)
==(5/6)*(2/25)
==1/15
⑦、53.2÷【(6.5-2又1/4)÷8又1/2】
解,得:
==53.2÷【(6.5-2.25)÷8.5】
==53.2÷【4.25÷8.5】
==53.2÷0.5
==106.4