(19+18+17+16+15)-(14+13+12+11)和是多少?

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(19+18+17+16+15)-(14+13+12+11)和是多少?

(19+18+17+16+15)-(14+13+12+11)和是多少?
(19+18+17+16+15)-(14+13+12+11)和是多少?

(19+18+17+16+15)-(14+13+12+11)和是多少?
(19+18+17+16+15)-(14+13+12+11)
=(19-14)+(18-13)+(17-12)+(16-11)+15
=5+5+5+5+15
=20+15
=35

35

(19+18+17+16+15)-(14+13+12+11)
=19+(18-14)+(17-13)+(16-12)+(15-11)
=19+4+4+4+4
=19+16
=35

解:(19+18+17+16+15)-(14+13+12+11)
=5*5
=25
谢谢