o intrebare a fratelui meu de cls a 3 a : (28 : 7 : 2 ori 9 : 3 ori 6 : 4 )+(42 : 7 : 2 ori 8 : 6 ori 10 : 5 : 4 ) = ????
mihairaduioan:
9+2=11
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(28:7:2*9:3*6:4)+(42:7:2*8:6*10:5:4)=
=(4:2*9:3*6:4)+(6:2*8:6*10:5:4)=
=(2*9:3*6:4)+(3*8:6*10:5:4)=
=(18:3*6:4)+(24:6*10:5:4)=
=(6*6:4)+(4*10:5:4)=
=(36:4)+(40:5:4)=
=9+(8:4)=
=9+2=
=11.
=(4:2*9:3*6:4)+(6:2*8:6*10:5:4)=
=(2*9:3*6:4)+(3*8:6*10:5:4)=
=(18:3*6:4)+(24:6*10:5:4)=
=(6*6:4)+(4*10:5:4)=
=(36:4)+(40:5:4)=
=9+(8:4)=
=9+2=
=11.
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