(-180-23) - (20-180) + (-250) x (-4)

= (- 203) - (-160) + 1000

=  (-43) + 1000

=957

947 nha h cho minh nha

23 . 75 + 25 . 23 + 180

= 23 . (75 + 25) + 180

= 23 . 100 + 180

= 2300 + 180 = 2480

b: \(B=16^5+2^{15}\)

\(=\left(2^4\right)^5+2^{15}\)

\(=2^{20}+2^{15}\)

\(=2^{15}\left(2^5+1\right)=2^{15}\cdot33⋮33\)

c: \(45⋮9;99⋮9;180⋮9\)

Do đó: \(45+99+180⋮9\)

=>\(C⋮9\)

d: \(D=2+2^2+2^3+...+2^{60}\)

\(=\left(2+2^2+2^3\right)+\left(2^4+2^5+2^6\right)+...+\left(2^{58}+2^{59}+2^{60}\right)\)

\(=2\left(1+2+2^2\right)+2^4\cdot\left(1+2+2^2\right)+...+2^{58}\left(1+2+2^2\right)\)

\(=7\left(2+2^4+...+2^{58}\right)⋮7\)

\(D=2+2^2+2^3+...+2^{60}\)

\(=\left(2+2^2+2^3+2^4\right)+\left(2^5+2^6+2^7+2^8\right)+...+\left(2^{57}+2^{58}+2^{59}+2^{60}\right)\)

\(=2\left(1+2+2^2+2^3\right)+2^5\left(1+2+2^2+2^3\right)+...+2^{57}\left(1+2+2^2+2^3\right)\)

\(=15\left(2+2^5+...+2^{57}\right)\)

=>D chia hết cho cả 3 và 5

Cách 1 : tính bình thường

(187-23)-(20-180)

=164-(-160)

=164+160

=324

Cách 2: phá ngoặc rồi tính 

(187-23)-(20-180)

=187-23-20+180

=164-20+180

=144+180

=324

(187-23)-(20-180)

=164-(-160)

=324

\(\left(187-23\right)-\left(20-180\right)\)

\(=187-23-20+180\)

\(=164-20+180\)

\(=144+180\)

\(=324\)

(187-23)-(20-180)

=164-(-160)

=164+160

=324

tick nha

23 x 75 + 25 x 23 + 180

= 23 x (75 +25 ) +180

= 23 x 100 + 180

= 2300+180

=2480

ủng hộ mik nha

23×75+25×23+180

=23×75+25×23+ 25 + 130

= 23 x ( 75 + 23 + 2 ) + 130

= 23 x 100 + 130

=2300 + 120

=2420

23 x 75 + 25 x 23 + 180

= 23 x ( 75 + 25 ) + 180

= 23 x 100 + 180

= 2300 + 180 

= 2480

=2480 nha

E = 4 + 42 + 4^3 + chấm chấm chấm + 4^n

E = 4 + 4² + 4^3 +...+ 4^n

23*75+25*10+25*13+180

= 69*25+25*10+25*13+180

=(69+10+13)25+180

=92*25+180

=2300+180

=2480

23 * 75 + 25 * 10 + 25 * 13 + 180

= 23 * 75 + 25 * ( 10 + 13 ) + 180

= 23 * 75 + 25 * 23 + 180

= 23 * ( 75 + 25 ) + 180

= 23 * 100 + 180

= 2300 + 180

= 2480