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Calculeaza in doua moduri : 17 X 123 + 15 X 17 = ; 70 : 5 + 20 : 5 = ; 21 X 14 + 2 X 7 X 16 = ; ( 34 : 2 + 100 : 10 : 2 ) = VA ROG !

Răspuns :

Răspuns:

17x123+15x17=17(123+15)=17x138=2346

17x123+15x17=2091+255=2346

Explicație pas cu pas:

70:5+20:5=90:5=18

70:5+20:5=14+4=18

21x14+2x7x16=21x14+14x16=14(21+16)=14x37=518

21x14+2x7x16=294+224=518

(34:2+100:10:2)=17+5=22