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calculeaza in doua moduri (123+12) x 3
(120-16)x4
5 x (325-250)
(42+18) x 16
11 x (32-15)
15 x (84-29)


Răspuns :

120-16
104x4=416 sau
120x4-16x4 =416
(123+12)x3=
=135x3=
=405
sau
3x123+3x12=
369+36=
=405

(120-16)x4=
=104x4=
=416
sau
4x120-4x16=
=480+64=
=416

5x(325-250)=
=5x75=
=375
sau
5x325-5x250=
=1625-1250=
= 375

(42+18)x16=
=60x16=
=960
sau
42x16+16x18=
=672+288=
=960

11x(32-15)=
=11x17=
=187
sau
11x32-11x15=
=352-165=
=187

15x(84-29)=
=15x55=
=825
sau
15x84-15x29=
=1260-435=
=825