135:(9×3)=
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![](https://rs.olm.vn/images/avt/0.png?1311)
1. 135 : 9 = 15
Từ đó ta có: 135 : (-9) = -15; (-135) : (-9) = 15
2. a) (-63) : 9 = - (63 : 9) = -7;
b) (-24) : (-8) = 24 : 8 = 3.
1.
135 : 9 = 15
Từ đó ta có: 135 : (-9) = -15 ; (-135) : (-9) = 15
2. a) (-63) : 9 = -7 ; (-24) : (-8) = 3
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 2:
a: \(=\left(-2\right)^3\cdot\left(-3\right)^3\cdot5^3=30^3\)
b: \(=3^3\cdot\left(-2\right)^3\cdot\left(-7\right)\cdot\left(-7\right)^2\)
\(=\left(3\cdot2\cdot7\right)^3=42^3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
(-18 - 9) x ( 18+9)
= -18 - 9 x 18+9
= ( -18 + 18 ) x ( 9-9 )
= 0x0
=0
135 x 15 + (-135) x 85
= -135 + 135 x ( 15 + 85 )
= 0 x 100
= 0
(-8) x (-3)3 x (+125)
=(-8) x (-27 ) x 125
= 125 x ( -8 ) x ( -27 )
= -1000 x ( -27)
= 27000
k mk na <3
![](https://rs.olm.vn/images/avt/0.png?1311)
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S = 1/3 + 1/9 +1/27 + 1/135 + 1/405
S = 135/405 + 45/405 + 15/405 + 3/405 + 1/405
S = \(\frac{135+45+15+3+1}{405}\)
S = \(\frac{199}{405}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+9\right)=135\)
\(\Rightarrow9x+\left(1+2+3+4+...+9\right)=135\)
\(\Rightarrow9x+45=135\)
\(\Rightarrow9x=90\)
\(\Rightarrow x=10\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 1 + 3 + 5 + ... + 101 ) x ( 456456 x 135 - 135135 x 456 )
= ( 1 + 3 + 5 + ... + 101 ) x ( 456 x 1001 x 135 - 135 x 1001 x 456 )
= ( 1 + 3 + 5 + ... + 101 ) x 0 = 0
=5 nhé HT
TL
=5 NHA BN
HT
K CHO MIK