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简便计算28*72(*22

28*【72-22】 =28*50 =1400

28x72-28x22 =28x(72-22) =28x50 =1400

原式 =36x56+72x22 =36x56+36x2x22 =36x56+36x44 =36x(56+44) =36x100 =3600 或者 =36x2x28+72x22 =72x28+72x33 =72x(28+22) =72x50 =36x2x50 =36x100 =3600

380分之57 =3/20 49分之28 =4/7 72分之48 =2/3 63分之49 =7/9 22分之4 =2/11 64分之44 =11/16

谁给你配的机器?不专业!超配1.33,正常超配范围在1.2以内,你这个得配140外机,河南这边格力定价偏高,FREEX不建议买,第五代多联机配下来43900,38000可以买到,如果不是河南区域可以更低

68×0.11+8.9×6.8 =6.8×(1.1+8.9) =6.8×10 =68

①28+165+72+235=(28+72)+(165+235)=100+400=500;②39×78+39×22=39×(78+22)=39×100=3900;③500÷4÷25=500÷(4×25)=500÷100=5;④186-54-46=186-(54+46)=186-100=86.

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