1998.1998 – 2000.1996 = 1998.(1996 + 2) – (1998 + 2).1996

= (1998.1996 + 2.1998) – (1998.1996 + 2.1996)

= 2.1998 – 2.1996 = 2(1998 – 1996) = 2.2 = 4

1. 1998.1998 – 2000.1996 = 1998.(1996 + 2) – (1998 + 2).1996

= (1998.1996 + 2.1998) – (1998.1996 + 2.1996)

= 2.1998 – 2.1996 = 2(1998 – 1996) = 2.2 = 4

1) 1998.1998 - 2000.1996
= 1998.1998 - 1998.1996 - 2.1996
= 2.1998 - 2.1996
= 2.2
= 4

2) 

Bài 1: 1998 x 1998-2000 x 1996

=1998x(2000-2) - 2000 x 1996

=1998x2000 - 1998x2 - 2000x1996

=( 1998x2000- 2000x1996) - 1998 x 2

= 2000x( 1998-1996 ) - 1998 x 2

= 2000 x 2 - 1998 x 2

=2 x (2000-1998)

= 2 x 2

= 4

a) 1998.1998-2000.1996

= 1998.(2000-2)-2000.1996

= 1998.2000-1998.2-2000.1996

=2000.(1998-1996)-1998.2

=2000.2-1998.2

=2.(2000-1998)

=2.2

=4

\(\frac{2^8\times6}{3^3\times5^4}\div\frac{8^3\times9}{5^3\times3^3}-\left(2^{14}+3^{19}\right)\left(3^{81}+5^{64}\right)\left(2^4-4^2\right)\)

\(=\frac{2^9\times3}{3^3\times5^4}\times\frac{5^3\times3^3}{2^9\times3^2}-\left(2^{14}+3^{19}\right)\left(3^{81}+5^{64}\right)\left(2^4-2^4\right)\)

\(=\frac{2^9\times3^4\times5^3}{3^5\times5^4\times2^9}-\left(2^{14}+3^{19}\right)\left(3^{81}+5^{64}\right)\times0\)

\(=\frac{1}{3\times5}-0\)

\(=\frac{1}{15}\)

liệt ra mệt lắm

C1:(-5)³.(-4).(-2)=(-125).(-4).(-2)=[(-125).(-4)].(-2)=500.(-2)=-1000

C2:(-5)³.(-4).(-2)=(-125).(-4).(-2)=(-125).[(-4).(-2)]=(-125).8=-1000

C3:(-5)³.(-4).(-2)=(-125).(-4).(-2)=[(-125).(-2)].(-4)=250.(-4)=-1000

ket qua ra -1000 ban nha