a, (-72).(15 - 49) + 15.(-56 + 72)

= -72 . 15 + 72.49  - 15.56 + 15.72

= (-72.15 + 15.72) + (72.49  - 15.56)

= 3528 - 84

= 2688

1b, 1532 + (-186) + (-1432) + (-14) + 123

= (1532 - 1432) - (186 + 14) + 123

= 100 - 200 + 123

= 223 - 200

= 23 

43.(53 - 81) + 53.(81 - 43)

= 43.53 - 81.43 + 53.81 - 53.43

= (43.53 - 53.43) + (81.53 - 81.43)

= 0 + 81.(53-43)

= 81.10

= 810

Ta có

/31-17/-/13-52/

=/14/-/-39/

=14+39=53

b,

126+(-20)+/124/-(-320)-/-150/

=126-20+124+320-150

=400

Tick cho mình nha bạn.Nhân dịp năm mới chúc bạn mạnh khoẻ,vui vẻ,học giỏi nha.

a, -25

b,400

c,-56

-25

400

-56

\(\dfrac{-8}{3}\)

\(\left(5^{19}\cdot5^{14}\right):5^{32}\)

\(=5^{19+14}:5^{32}\)

\(=5^{33}:5^{32}\)

\(=5^{33-32}\)

\(=5\)

= ( -38 ). ( 47 + 52 + 1 )

= ( -38 ). 100 = -3800

(-38) . 47 + (-38) . 52 + (-38)

= (-38) . 47 + (-38) . 52 + (-38) . 1

= (-38). (47 + 52 + 1)

= (-38) . 100

= -3800

\(B=\frac{5.2^{15}.3^{30}-5.7^5.2^5.2^{12}}{5^4.2^{14}.3^{14}.3^7.3^7-2^2.3.2^{15}.7^5}\)

=> \(B=\frac{5.2^{15}.3^{30}-5.7^5.2^{17}}{5^4.2^{14}.3^{28}-2^{17}.3.7}\)

=> \(B=\frac{5.2.3^{30}-5.7^5.2^3}{5^4.3^{28}-2^3.3.7}=0,144\)

* =7 nha

1687257

:::::::::::::::::
DQAS