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十字想乘得0.25X=8*1.25即0.25X=10,X=10/0.25=40 所以X=40
(1+9)×3-7=23 (3-1)×7+9=23
設這個數為x 那麼,有比例式為: 1/2x:1=30:20 得x=3
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