Question

用递等式计算

( 1 )15分之8乘(3分之2+4分之1)

( 2 )4分之3+(6分之5减3分之2)除以9分之2

(3)4分之3乘60％+0.75乘5分之1

﹙4﹚[2分之1÷﹙4分之3减3分之1﹚]乘12分之5

Answer 1

递等式计算怎么算！

Answer 2

( 1 )15分之8乘(3分之2+4分之1)
=8/15*2/3+8/15*1/4
=16/45+2/15
=16/45+6/45
=18/45
=2/5
( 2 )4分之3+(6分之5减3分之2)除以9分之2
=3/4+(5/6-4/6)/(2/9)
=3/4+1/6*9/2
=3/4+3/4
=3/2

(3)4分之3乘60％+0.75乘5分之1
=3/4*3/5+3/4*1/5
=9/20+3/20
=12/20
=3/5

﹙4﹚[2分之1÷﹙4分之3减3分之1﹚]乘12分之5
=[1/2/(9/12-4/12)]*5/12
=(1/2*12/5)*5/12
=1/2*12/5*5/12
=1/2