(3/8+1/3—0.75)×24

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(3/8+1/3—0.75)×24
(3/8+1/3—0.75)×24

(3/8+1/3—0.75)×24
得3/8x24+1/3x24-3/4x24得3x3+1x8-3x6得9+8-18得-1

-1