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列竖式计算4.56X14÷1.2

(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.

456-56×7 =456-56-56×6 =400-336 =64

(49+31×56)÷7 =(7×7+31×7×8)÷7 =(7×7+7×248)÷7 =[7×(7+248)]÷7 =(7×255)÷7 =255

(3),=3.2ⅹ(1.1+8.9)

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