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21.6÷0.8%1.2x5 用脱式计算

21.6÷0.8-1.2x5 =27-6 =21

690十47X52一398脱式计算 =690+2444-398 =3134-398 =2736 98一18X5十170 =98-90+170 =8+170 =178 15X7十85X2 =105+170 =275 720÷36÷2 =20÷2 =10

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