15.37*7.89-9.37*7.89+15.37*2.11-9.37*2.11怎样简算?

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15.37*7.89-9.37*7.89+15.37*2.11-9.37*2.11怎样简算?

15.37*7.89-9.37*7.89+15.37*2.11-9.37*2.11怎样简算?
15.37*7.89-9.37*7.89+15.37*2.11-9.37*2.11怎样简算?

15.37*7.89-9.37*7.89+15.37*2.11-9.37*2.11怎样简算?
15.37*7.89-9.37*7.89+15.37*2.11-9.37*2.11
=15.37*(7.89+2.11)-9.37*(7.89+2.11)
=15.37*10-9.37*10
=10*(15.37-9.37)
=10*6
=60

原式=(15.37-9.37)*7.89+(15.37-9.37)*2.11
=6*7.89+6.*2.11
=6*(7.89+2.11)
=6*10
=60

(15.37*7.89+15.37*2.11)-(9.37*7.89+9.37*2.11)=15.37*10-9.37*10=60