(1)3åä¸åä¹ä¸Ã1åäºåä¹ä¸Ãå
«åä¹ä¸
=(10/3)x(6/5)x(3/8)
=3/2
(2)1åå
åä¹ä¸Ã3åäºåä¹ä¸Ã1åäºåä¸åä¹å
=(7/6)x(18/5)x(25/21)
=5
(3)åä¸åä¹äºÃä¸åäºåä¹ä¸åä¹+åååä¹ä¸
=(5/13)x(39/35)+(1/14)
=(3/7)+(1/14)
=7/14
=1/2
(4)åäºåä¹ä¸+åäºåä¹å
«Ãååä¹ä¸
=(7/15)+(8/15)x(3/4)
=(7/15)+(6/15)
=13/15
(5) (2åååä¹ä¸+8åä¸åä¹äº)Ã12
=(11/4+26/3)x12
=(11/4)x12+(26/3)x12
=33+104
=137
(6)äºåä¸åä¹äºÃ2åååä¹ä¸-äºåä¸åä¹äºÃ1åäºåä¹å
=(5/27)x(9/4)-(5/27)x(9/5)
=9*(5/27)(1/4-1/5)
=9*(5/27)(1/20)
=(1/3)(1/4)
=1/12
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