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\(\left(-25\right)\cdot125\cdot4\cdot\left(-8\right)\cdot\left(-17\right)\)
\(=100\cdot1000\cdot\left(-17\right)\)
\(=-1700000\)
d: \(=\dfrac{-7}{9}\left(\dfrac{3}{11}+\dfrac{8}{11}\right)+1+\dfrac{7}{9}=1\)
e: \(=\dfrac{1}{5}\left(\dfrac{10}{19}+\dfrac{9}{19}\right)-\dfrac{2}{35}=\dfrac{1}{5}-\dfrac{2}{35}=\dfrac{5}{35}=\dfrac{1}{7}\)
f: \(=\left(-25\cdot4\right)\cdot\left(-8\cdot125\right)\cdot\left(-17\right)=-1700000\)
a) (- 25) x 125,4 x (-8) x (-17)
= (- 25 x 4) x (- 8 x 125) x (-17)
= (-100) x (-1000) x (-17)
= - 1 700 000
b) \(\frac{-3}{4}+\frac{2}{7}+\frac{-1}{4}+\frac{3}{5}+\frac{5}{7}\)
\(=\left(\frac{-3}{4}+\frac{-1}{4}\right)+\left(\frac{2}{7}+\frac{5}{7}\right)+\frac{3}{5}\)
\(=-1+1+\frac{3}{5}\)
\(=0+\frac{3}{5}=\frac{3}{5}\)
c) \(\frac{7}{19}.\frac{8}{11}+\frac{7}{19}.\frac{3}{11}-\frac{12}{19}\)
\(=\frac{7}{19}.\left(\frac{8}{11}+\frac{3}{11}\right)-\frac{12}{19}\)
\(=\frac{7}{19}.1-\frac{12}{19}\)
\(=\frac{7}{19}-\frac{12}{19}=\frac{-5}{19}\)
d) \(19\frac{5}{8}:\frac{7}{2013}-26\frac{5}{8}:\frac{7}{2013}\)
\(=\left(19\frac{5}{8}-26\frac{5}{8}\right):\frac{7}{2013}\)
\(=-7:\frac{7}{2013}\)
\(=-2013\)
e) \(\frac{-5}{12}.\frac{2}{11}+\frac{-5}{12}.\frac{9}{11}+\frac{5}{12}\)
\(=\frac{-5}{12}.\left(\frac{2}{11}+\frac{9}{11}\right)+\frac{5}{12}\)
\(=\frac{-5}{12}.1+\frac{5}{12}\)
\(=\frac{-5}{12}+\frac{5}{12}=0\)
~Học tốt~
\(4x:17=0\)
\(4x=0:17\)
\(\Rightarrow x=0\)
\(7x-8=713\)
\(7x=705\)
\(\Rightarrow x=100\frac{5}{7}\)
\(8\left(x-3\right)=0\)
\(8.x-8.3=0\)
\(8x=0+8.3\)
\(8x=24\)
\(\Rightarrow x=3\)
5) 125. (−8). (−25). 9.4.1000 : 3
=[125.(-8)].[(-25).4].(9:3).1000
=-1000.(-100).3.1000
=100000.3.1000
=300000.1000
=300000000
6) (−2)3 . 13.125
=-8.13.125
=(-8.125).13
=-1000.13
=-13000
7) 17. (38 − 5) − 38. (17 − 1)
=17 . 33 - 38 . 16
=561-608
=-47
8) (−41). 135 + 135. (−58) − 135
=(-41).135+135.(-58)+135.(-1)
=135.[-41+(-58)+(-1)]
=135.(-100)
=-13500
a,-2x -(x-17)=34-(-x+25)
-2x-x+17=34+x-25
-3x+17=9+x
-3x-x=9-17
-4x=-8
-->4x=8
x=8:4
x=2
Vậy x=2
b,17-(16x-37)=2x+43
17-16x+37=2x+43
20-16x=2x+43
-16x-2x=43-20
-18x=23
x=23:(-18)
x=23/-18
Mà x là số nguyên nên --> x thuộc tập rỗng
c,-2x-3.(x-17)=34-2(-x+25)
-2x-3x+51=34-2.(-x)-25
-5x+51=9-(-2).x
-5x+(-2).x=9-51
-7x=-42
7x=42
x=42:7
x=6
Vậy x=6
a. 1619 = (24)19 = 276
825 = (23)25 = 275
Vì 276 > 275 nên 1619 > 825
b. 2711 = (33)11 = 333
818 = (34)8 = 332
Vì 333 > 322 nên 2711 > 818
c. 220 = 217. 23 = 217 . 8
Vì 217 . 8 > 217 . 7 nên 220 > 217 . 7
d. 2161 > 2160 = (24)40 = 1640
Vì 1640 > 1340 mà 2161 > 1640 nên 2161 > 1340
\(\left(-25\right)\cdot125\cdot4\cdot\left(-8\right)\cdot\left(-17\right)\\ =\left[\left(-25\right)\cdot4\right]\cdot\left[125\cdot\left(-8\right)\right]\cdot\left(-17\right)\\ =\left(-100\right)\cdot\left(-1000\right)\cdot\left(-17\right)\\ =...\)
Ok, thế thôi. Chúc bạn học tốt nha.
(-25).125.4.(-8).(-17)
=[(-25).4].[125.(-8)].(-17)
=(-100).(-1000).(-17)
=100000.(-17)
=-1700000