a, $( -25).21.( -2)².( -| -3|).( -1)^{2n+1}$
Vì n∈ N* nên 2n+1 lẽ
⇒ $( -25).21.( -2)².( -| -3|).( -1)^{2n+1}$
= $( -25).21.4.( -3).( -1)$
= $.( -25.4).21.3$
= $-100.63$
= $-6300$
b, $( -5)³.67.( -| -2³|).( -1)^{2n}$
Vì n∈ N* nên 2n chẵn
⇒ $-125.67.( -8).1$
= $125.8.67$
= $1000.67$
= $67000$
c, 35.18-5.7.28
= 35.18-35.28
= 35.( 18-28)
= 35.( -10)
= -350
d, 24.( 16-5)-16.( 24-5)
= 24.16-24.5-16.24+16.5
= -24.5+16.5
= 5.( -24+16)
= 5.( -8)
= -40
e, 29.( 19-13)-19.( 29-13)
= 29.19-29.13-19.29+19.13
= -29.13+19.13
= 13.( -29+19)
= 13.( -10)
= -130
