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

                                                = 23.75 + 25.23 + 180 = 23.(75 + 25) + 180

                                                = 23.100 + 180 = 2300 + 180 = 2480

23 x 75 + 25 x 10 + 25 x 13 + 180

= 23 x 75 + 25 x ( 10 + 13 ) + 180

= 23 x 75 + 23 x 25 + 180

= 23 x ( 75 + 25 ) + 180

= 23 x 100 + 180

= 2300 + 180

= 2480

~ HOK TỐT ~

\(23.75+25.10+25.13+180\)

\(=23.75+25\left(10+13\right)+180\)

\(=23.75+25.23+180\)

\(=23\left(75+25\right)+180\)

\(=23.100+180\)

\(=2300+180\)

\(=2480\)

a) 1+2+3+...+2018

=[(2018-1):1+1].(2018+1):2

=2018.2019:2

=2037171

b) 4+7+10+13+...+2017

=[(2017-4):3+1].(2017+4):2

=672.2021:2

=679056

c) 1+2-3-4+5+6-7-8+9+10-11-12+13+14

=(1+2-3-4)+(5+6-7-8)+(9+10-11-12)+13+14

=-4+(-4)+(-4)+13+14

=-12+27

=15

d) 23 x 75 + 25 x 23 + 180

=23 x (75+25) +180

=23 x 100 +180

=2300+180

2480

chúc ban hoc tốt nha

a) Số số hạng: ( 2018 - 1 ) : 1 + 1 = 2018

   Tổng:           2018 x ( 2018 + 1 ) : 2 = 2 037 171

b) Số số hạng: ( 2017 - 4 ) : 3 + 1 = 672

    Tổng: 672 x ( 2017 + 4 ) : 2 = 679 056

câu 1                         = 2480

câu 2                       = 11800

23 . 75 + 25 . 23 + 180

= 23 . (75 + 25) + 180

= 23 . 100 + 180

= 2300 + 180 = 2480

Bạn có thể viết rõ hơn ra được không ạ . Chứ mình nhìn nó ra nhiều trường hợp lắm . 

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

\(\frac{-23}{25}.\frac{10}{13}+\frac{-23}{25}.\frac{3}{13}+\frac{-27}{25}\)

= \(\frac{-23}{25}.\left(\frac{10}{13}+\frac{3}{13}\right)+\frac{-27}{25}\)

= \(\frac{-23}{25}.1+\frac{-27}{25}\)

= \(\frac{-23}{25}+\frac{-27}{25}\)

= \(\frac{-50}{25}\)

= \(-2\)

\(\frac{-23}{25}.\frac{10}{13}+\frac{-23}{25}.\frac{3}{13}+\frac{-27}{25}\)

\(=\frac{-23}{25}\left(\frac{10}{13}+\frac{3}{13}\right)+\frac{-27}{25}\)

\(=\frac{-23}{25}+\frac{-27}{25}=\frac{-50}{25}=-2\)

-23/25.10/13+-23/25.3/13+-27/25

= -23/25(10/13+3/13)+-27/25

= -23/25.1+-27/25

= -23/25+-27/25

= -2

1/\(\left(-12\right)\cdot46-12\cdot54=\left(-12\right)\cdot46+\left(-12\right)\cdot54\)

\(=\left(-12\right)\cdot\left(46+54\right)=\left(-12\right)\cdot100=-1200\)

2/\(3784+23-3785-15=3785+22-3785-15\)

\(=22-15=7\)

3/\(\left(-8\right)\cdot25\cdot\left(-2\right)\cdot4\cdot\left(-5\right)\cdot125\)

\(=\left[\left(-8\right)\cdot125\right]\cdot\left[25\cdot4\right]\cdot\left[\left(-5\right)\cdot\left(-2\right)\right]\)

\(=\left(-1000\right)\cdot100\cdot10=-1000000\)

4/\(19\cdot25+9\cdot95+19\cdot30=19\cdot\left(25+30\right)+9\cdot95\)

\(=19\cdot55+9\cdot95=95\cdot11+9\cdot95=95\cdot\left(11+9\right)=20\cdot95=1900\)

5/\(\left(-50+19+143\right)-\left(-79+25+48\right)\)

\(=\left(-50\right)+19+143+79-25-48\)

\(=118\)

6/\(\left(-25\right)\cdot\left(75-45\right)-75\cdot\left(45-25\right)\)

\(=\left(-25\right)\cdot30+\left(-25\right)\cdot3\cdot20\)

\(=\left(-25\right)\cdot\left(30+60\right)=\left(-25\right)\cdot90=-2250\)

7/\(\left(-37-17\right)\cdot\left(-9\right)+35\left(-9-11\right)\)

\(=\left(-54\right)\cdot\left(-9\right)+35\cdot\left(-20\right)\)

\(=486+\left(-700\right)=-214\)

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

\(=187-23-20+180=324\)

9/\(512\cdot2-128\cdot\left(-512\right)\)

\(=512\cdot2+128\cdot512=512\cdot\left(2+128\right)\)

\(=512\cdot130=66560\)

10/\(17\cdot\left(-25\right)+25\cdot21\)

\(=17\cdot\left(-25\right)-\left(-25\right)\cdot21=\left(-25\right)\cdot\left(17-21\right)\)

\(=\left(-25\right)\cdot\left(-4\right)=100\)

Chúc bạn học tốt.