23*75+25*10+25*13+180
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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 ~
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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
![](https://rs.olm.vn/images/avt/0.png?1311)
23 . 75 + 25 . 23 + 180
= 23 . (75 + 25) + 180
= 23 . 100 + 180
= 2300 + 180 = 2480
![](https://rs.olm.vn/images/avt/0.png?1311)
Bạn có thể viết rõ hơn ra được không ạ . Chứ mình nhìn nó ra nhiều trường hợp lắm .
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
-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
-23/25.10/13+-23/25.3/13+27/25
= -23/25.(10/13+3/10)+ -27/25
=23/25.1+-27/25
=23/25+ -27/25
=-2
![](https://rs.olm.vn/images/avt/0.png?1311)
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.
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