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39x5X4=多少,用脱式计算

5.73x4.27+5.73x5.73 =5.73x(4.27+5.73) =5.73x10 =57.3

102x54 =(100+2)x54 =100x54+2x54 =5400+108 =5508

题干不详

6×5-7 =30-7 =23

[(X-5)x5+5]÷5=5 解:[(X-5)×5+5]=5×5 (X-5)×5+5=25 (X-5)×5=25-5 (X-5)×5=20 X-5=20÷5 X-5=4 X=5+4 X=9

=210÷70 =3

21.6÷0.8-1.2x5 =27-6 =21

7.2x5.3+ 7.2x4.6+ 7.2x0.1 =7.2x(5.3+4.6+0.1) =7.2x10 =72

63/3=21 (79+21)x5 =100x5 =500

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