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model:
b)3 *24 =3*(20+4)=3*(10+10+4)=3*10+3*10+3*4=30+30+12= 72
b *22=
7*23=

c)5*123=5*(100+20+3)= 5*100+5*20+5*3=500+100+15= 615
4*234=
6*142=

vaa roog,ajutati-ma, imi trebuie pentru maine

Răspuns :

SignOfTheTimes
b) 7•23 = 7(20+3) = 7(10+10+3) = 7•10+7•10+7•3 = 70+70+21 = 140+21 = 161.



c) 4•234 = 4(200+30+4) = 4•200+4•30+4•4 = 800+120+16 = 920+16 = 936.

6•142 = 6(100+40+2) = 6•100+6•40+6•2 = 600+240+12 = 840+12 = 852.

Succes!

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