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Calculați in doua moduri: a)17×7+64×7+7×119 b)450×21+550×21-2100 c) 736×17-236×17+200×17

Răspuns :

a)m1:7•(17+64+119)=
7•200=1400
m2:faci calculele
b)m1:21•(450+550-100)=
21•900=18900
m2:faci calculele
c)m1:17•(736-236+200)=
17•700=11900
m2:faci calculele