题目内容

求未知数。
(1)15x+7x=66 (2)9x-8x=15.8
(3)7.5x+2.5x=2 (4)4x+5x=810
(5)75+8x=125 (6)96x+8x=208
(7)52x-4x=120 (8)7.2x-x=49.6

(1)15x+7x=66
              22x=66
                 x=3

(2)9x-8x=15.8
               x=15.8
 

(3)7.5x+2.5x=2
                  10x=2.5
                     x=0.25

(4)4x+5x=810
              9x=810
                x=90
(5)75+8x=125
              8x=125-75
              8x=50
               x=6.25
(6)96x+8x=208
            104x=208
                 x=2
 
(7)52x-4x=120
             48x=120
                x=2.5

(8)7.2x-x=49.6
            6.2x=49.6
                 x=8

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