Question

Dau coroana va rog

Doar ex 5

Answer 1

Răspuns:

a) 35*99=35*(100-1)=35*100-35*1=3500-35=3465

b) 27*101=27*(100+1)=27*100+27*1=2700+27=2727

c) 15*102=15*(100+2)=15*100+15*2=1500+30=1530

d) 31*98=31*(100-2)=31*100-31*2=3100-62=3038

e) 4*999=4*(1000-1)=4*1000-4*1=4000-4=3996

f) 5*1004=5*(1000+4)=5*1000+5*4=5000+20=5020