815=(80+1)5=805+15=........4087=..................3974=(400-3)4=4004-34=.........................2984=....................................ПОМОГИТЕ РЕШИТЬ!!!!!!!!!!!!!!

Question

815=(80+1)5=805+15=........4087=..................3974=(400-3)4=4004-34=.........................2984=....................................ПОМОГИТЕ РЕШИТЬ!!!!!!!!!!!!!!

81*5=(80+1)*5=80*5+1*5=........ 408*7=.................. 397*4=(400-3)*4=400*4-3*4=......................... 298*4=.................................... ПОМОГИТЕ РЕШИТЬ!!!!!!!!!!!!!!

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Ответ(ы) на вопрос:

Accepted Answer

81*5=(80+1)*5=80*5+1*5=400+5=405 408*7=(400+8)*7=400*7+8*7=2800+56=2856 397*4=(400-3)*4=400*4-3*4=1600-12=1588 298*4=(300-2)*4=300*4-2*4=1200-8=1192

81*5=(80+1)*5=80*5+1*5=........408*7=..................397*4=(400-3)*4=400*4-3*4=.........................298*4=....................................ПОМОГИТЕ РЕШИТЬ!!!!!!!!!!!!!!

815=(80+1)5=805+15=........4087=..................3974=(400-3)4=4004-34=.........................2984=....................................ПОМОГИТЕ РЕШИТЬ!!!!!!!!!!!!!!