Bấm máy tính ta đc kết quả là: \(-530\)

\(\text{-457+(-123)+23+27}\)

\(\text{= -457-123+23+27}\)

\(\text{= (-457+27) - (123-23)}\)

\(\text{= -430 - 100 = -530}\)

a: \(\left(3965-2378\right)-\left(437-1378\right)-528\)

\(=3965-2378-437+1378-528\)

\(=\left(3965-437-528\right)-\left(2378-1378\right)\)

\(=3000-1000=2000\)

b: \(\left(-457\right)+\left(-123\right)+23+237\)

\(=\left(-457+237\right)+\left(-123+23\right)\)

\(=-220-100=-320\)

c: \(\left(-329\right)-\left(15-101\right)-\left(25-440\right)\)

\(=-329-15+101-25+440\)

\(=\left(440-15-25\right)+\left(-329+101\right)\)

\(=400-228=172\)

1.Tính

a) (-16).10=-160

b) 23.(-5)=-115

c) (-24).(-25)=600

d) (-12)^2=144

2.Tính

a) 2316+115=2431

b) (-315)+(-15)=-330

c) (-215)+125=-90

d) (-200)+200=0

3.Hảy tính

a) (-457)+(-123)+23+237=-320

b) (-135)+48+140+(-5)=48

chúc bạn là bài tốt

0

5

5 tick nha Đnh Công An

\(\left[\left(-457\right)+257\right]+\left[\left(-123\right)+123\right]\)

\(=\left(-200\right)+0=-200\)

\(\left(-457\right)+\left(-123\right)+123+257\)

\(=\left[\left(-123\right)+123\right]+\left[\left(-457\right)+257\right]\)

\(=0+\left(-200\right)=-200.\)

các bạn giúp mình nha

​

ko biết

Ta có 23/45>8/25

Nên 23/45>8/19

Ta có 123/25<233/25

Nên 123/25<233/237

tính = cách hợp lí nhất

g: \(=-457+237+23-123=-220-100=-320\)

h: \(=\left(1-3\right)+\left(5-7\right)+...+\left(41-43\right)+\left(45-47\right)\)

\(=\left(-2\right)+\left(-2\right)+...+\left(-2\right)+\left(-2\right)\)

\(=-2\cdot12=-24\)

i: \(=173+27-46-54-19=200-100-19=100-19=81\)

k: \(=-52+82+49-15+13-36\)

\(=30+34-23\)

=30+11

=41

l: \(=\left(3-5\right)+\left(7-9\right)+\left(11-13\right)+\left(15-17\right)\)

\(=\left(-2\right)+\left(-2\right)+\left(-2\right)+\left(-2\right)\)

=-8

m: \(=\left(1-2\right)+\left(3-4\right)+...+\left(2001-2002\right)+2003\)

\(=2003-1-1-...-1\)

\(=2003-1001=1002\)

n:Số số hạng là:

\(\left[\left(-51\right)-\left(-99\right)\right]:1+1=49\left(số\right)\)

Tổng là \(\left(-51-99\right)\cdot\dfrac{49}{2}=-3675\)

o: \(=-62-38+1523-2523-92\)

\(=-100+1000-92=900-92=808\)