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列竖式计算4.56X14÷1.2

575÷4=143.75

(1)①原式=-1-8÷4×(5-9)=-1+8=7;②原式=-8-23?1124× (?24)=213;(2)原式=-3x2+10y,当x=?12,y=14时,原式=74.

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