Question

很急很急

填空
1除以7分之5+（）乘以5分之2=2分之三 4分之3乘以《（）+3分之1》除以3分之1=2

解方程
7x除以3分之2=14 12分之13x=18乘以24分之13

Answer 1

1÷(5/7)+()×(2/5)=3/2
===> (7/5)+()×(2/5)=3/2
===> 14+4()=15
===> ()=1/4

(3/4)×[()+(1/3)]÷(1/3)=2
===> (9/4)×[()+(1/3)]=2
===> ()+(1/3)=2×(4/9)=8/9
===> ()=(8/9)-(1/3)
===> ()=5/9

7x÷(2/3)=14
===> 7x×(3/2)=14
===> (21/2)x=14
===> x=14×(2/21)
===> x=4/3

(13/12)x=18×(13/24)
===> x=18×(13/24)×(12/13)
===> x=9