Question

Exerciţii şi probler 1. Calculează! a) 28 x 34 = 285 ×9= 104 x 7 = b) (5+5x5) x5-5+5x5 2x [35+2x (500 - 398)] - 428 279 +9x [27+27 x (27-9x0) +9]+9-7​

Answer 1

Răspuns:

Explicație pas cu pas:

1. Calculează! a) 28 x 34 =952

285 ×9=2565

104 x 7 =728

b) (5+5x5) x5-5+5x5 2x [35+2x (500 - 398)] - 428 279 +9x [27+27 x (27-9x0) +9]+9-7​=

(5+25)·5-5+25=30·5+20=150-20=130

2x [35+2x (500 - 398)] - 428=2[35+2(500-398)]==2(35+2·102)=

=2(35+204)=2·239=478

279 +9x [27+27 x (27-9x0) +9]+9-7​=279+2+9(27+27·27+9)=

=281+9·765=281+6885=7166

Answer 2

Răspuns:

Explicație pas cu pas: