(x+1.2)/2=1½ (解方程)

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(x+1.2)/2=1½(解方程)(x+1.2)/2=1½(解方程)(x+1.2)/2=1½(解方程)(x+1.2)/2=1½x+1.2=3x=1.8

(x+1.2)/2=1½ (解方程)
(x+1.2)/2=1½ (解方程)

(x+1.2)/2=1½ (解方程)
(x+1.2)/2=1½
x+1.2=3
x=1.8