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a fost răspuns

calculeaza dupa modelul dat EX 2×312= 2×(300+10+2) = 2×300+2×10+2×2 =600+20+4 =624 a) 123+3 241×2 b) 5×111 2×243

Răspuns :

123+3=2×(100+20+3)=2*100+2*20+2*3=200+40+6=246
241×2=(200+40+1)×2=200×2+40×2+1×2=400+80+2=482

5×111=(100+10+1)×5=5×100+5×10+5×1=500+50+5=555


2×243=2×(200+40+3)=2×200+2×40+2×3=400+80+6=486

Elefantel
a)
123x3=3(100+20+3)
=3x100+3x20+3x3
=300+60+9
=369

241x2=2(200+40+1)
=2x200+2x40+2x1
=400+80+2
=482

b)5x111=5(100+10+1)
=5x100+5x10+5x1=
500+50+5=
=555

2x243=2(200+40+3)=
=2x200+2x40+2x3=
=400+80+6=
=486
Cu placere :D