解方程或解比例. x-0.5x=27.5 (x-6)

解方程或解比例. x-0.5x=27.5 (x-6)×(1+40%)=56 9:x= 1 5 : 1 3 .
2024-12-16 20:42:34
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回答1:

(1)x-0.5x=27.5,
      0.5x÷0.5=27.5÷0.5,
              x=55;

(2)(x-6)×(1+40%)=56,
      (x-6)×1.4÷1.4=56÷1.4,
                  x-6+6=40+6,
                      x=46;

(3)9:x=
1
5
1
3

     
1
5
x=9×
1
3

  
1
5
x ÷
1
5
=3 ÷
1
5

        x=15.