Question

Calculati factorul comun:
1)14×13-13×7+27×17-17×14
2)13×15+13×12+14×12+14×15
3)2×19+2×31+2×50
4)87×112-87×100+12×13
5)68×123-107×68+16×32​

Answer 1

Răspuns:

Explicație pas cu pas:

1)14×13-13×7+27×17-17×14=13(14-7)+17(27-14)= 13x7+13x17=13x(7+17)= 13x24=312

2)13×15+13×12+14×12+14×15=13(15+12)+14(12+15)=13x27+14x27=27(13+14)=27²

3)2×19+2×31+2×50= 2(19+31+50)=2x100=2000

4)87×112-87×100+12×13=87(112-100)+12x13= 87x12+12x13=12(87+13)= 12x100= 1200

5)68×123-107×68+16×32​= 68(123-107)+16x32= 68x16+16x32= 16(68+32)=16x100= 1600