9åä¹4÷(3-7åä¹5*15åä¹14)
=4/9÷ï¼3-2/3ï¼
=4/9÷7/3
=4/21
2åä¹1+(3åä¹1÷5åä¹2-3åä¹1)
=1/2+ï¼5/6-1/3ï¼
=1/2+1/2
=1
7åä¹5*11åä¹7+11åä¹7*7åä¹6
=7/11*ï¼5/7+6/7ï¼
=7/11*11/7
=1
4åä¹1*9åä¹1*16*45
=ï¼1/4*16ï¼*ï¼1/9*45ï¼
=4*5
=20
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