Question

Ioana a facut 3 bratari. In fiecare bratara a asezat 3 margele rosii, 3 margele galbene si 3 margele albastre. Cate margele a facut Ioana in total ? Scrie rezolvarea printr-un exercitiu cu paranteza, apoi calculeaza.

Fara a efectua calculele, spune daca egalitatile sunt adevarate. Justifica.
4x(3+5)=3x4+5x4
6x(9-4)=6x9-6x4
7x2+7x3=7+2x7+3
6x(7+9)=(9+7)x6

Answer 1

3 bratari=3 margele rosii+3 margele galbene+3 margele albastre
3x(3+3+3)=3x9=27

4x(3+5)=3x4+5x4
4x8=32---12+20=32 (A)
6x(9-4)=6x9-6x4
6x5=30----54-24=30 (A)
7x2+7x3=7+2x7+3
14+21=35----7+14+3=24 (F)
6x(7+9)=(9+7)x6
6x16=96----16x6=96 (A)
sper ca ti-am fost de folos....bafta!!!