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85➗0.17➗5简便计算

:52➗5十53➗5十54➗5十55➗5十56➗5 =(52+53+54+55+56)÷5 =54*5÷5 =54

简便计算: 80➗16 =80➗8➗2 =10➗2 =5

510➗2➗5 =510➗(2×5) =510➗10 =51

5100➗15➗17怎么算简便 5100➗15➗17 =5100÷17÷15 =300÷15 =20

460➗25 =92x5➗5➗5 =92➗5 =18.4

结合律。 列式为: 2100➗42 =2100➗(7x6) =2100➗7➗6 =300➗6 =50

()+()=8++()+()=6||||138设:x+y=8,z+w=6,x+z=13,y+w=8则:x+y=8(1)x+z=13(2)z+w=6(3)y+w=8(4)(4)-(3):y-z=2(5)(1)-(2):y-z=-5(6)(5)(6)矛盾因此原方程组无解

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