试题与答案

求x:13×(Χ-15)=93120:13=Χ:1143Χ+5Χ=16.

题型:解答题

题目:

求x:
1
3
×(Χ-15)=93
1
20
1
3
=Χ:1
1
4
3Χ+5Χ=16.

答案:

(1)

1
3
×(X-15)=93,

 

1
3
×(X-15)÷
1
3
=93÷
1
3

             X-15=279,

          X-15+15=279+15,

                X=294;

(2)

1
20
1
3
=X:1
1
4

        

1
3
X=
1
20
×1
1
4

        

1
3
X=
1
16

    

1
3
1
3
=
1
16
÷
1
3

           X=

3
16

(3)3X+5X=16,

        8X=16,

     8X÷8=16÷8,

         X=2.

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