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a) \(4^8\cdot4^4=\left(2^2\right)^8\cdot\left(2^2\right)^4=2^{16}\cdot2^8=2^{16+8}=2^{24}\)
b) \(5^{12}\cdot7-5^{11}\cdot10\)
\(=5^{11}\cdot\left(5\cdot7-10\right)=5^{11}\cdot\left(35-10\right)=5^{11}\cdot25\)
\(=5^{11}\cdot5^2=5^{11+2}=5^{13}\)
d) \(27^{16}:9^{10}\)
\(=\left(3^3\right)^{16}:\left(3^2\right)^{10}=3^{48}:3^{20}=3^{48-20}=3^{28}\)
e) \(125^3:25^4=\left(5^3\right)^3:\left(5^2\right)^4=5^9:5^8=5^{9-8}=5\)
f) \(24^4:3^4-32^{12}:16^{12}\)
\(=\left(24:4\right)^4-\left(32:16\right)^{12}\)
\(=6^4-2^{12}\)
\(=2^4\cdot\left(3^4-2^8\right)=2^4\cdot-175=-2800\)
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1/2×(2×x-3)+105/2=-137/2
1/2×(2×x-3)=-137/2-105/2
1/2×(2×x-3)=-242/2
2×x-3=-242/2:1/2
2×x-3=-242
2.x=(-242)+3
2.x=239
x=239:2
x=239/2
A,-12×25-25×75-25×13
=[(-12)-75-13].25
=(-100).25
-2500
B,-50/7×49/10-35/2×-10/7+ -25/3× -9/5
=(-35)-(-25)+(-13)
=-23
C,-354+265-156+125
=[(-354)-156]+(265+125)
=(-510)+277
=-233
D,-74+40-50+16-35
=(-74)+40+(-50)+16+(-35)
=[(-74)+(-35)]+[40+(-50)+16]
=(-109)+26
=-83
E,-2/3×4/5+-4/5×4/3-0,125
=-2/3.4/5+4/5.(-4/3)-0,125
=4/5.[-2/3+(-4/3)]-0,125
=4/5.(-2)-0,125
=-8/5-0,125
=(-1,6)+(-0,125)
=-1,725
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Tính nhanh
a) 183 : 93
= 23
= 8
b) 1253 : 254
= (53)3 : (52)4
= 59 : 58
= 5
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b>
2 mũ 56 nhân 125 mũ 7 = 3,435973837* 10 mủ 31
c>
625 mũ 5 nhân 25 mũ7 = 5,920766091* 10 mủ 23
d>
12 mũ 3 nhân 3 mũ 3 =10077606
e>
24 mũ 4 chia 3 mũ 4 - 32 mũ 12 nhân 16 mũ 12 = -2,882303762 * 10 mủ 17
g>
( 5 mũ 3 + 5 mũ 4 +125 mũ 2) chia 5 mũ 3= 131
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a, 410. 230=220.230=250
b,925.274.813= 350.312.312=374
Tương tự các câu khác....
a, 410.230 = (22)10.230 = 220.230 = 250
b, 925.274.813 = (32)25.(33)4.(34)3 = 350.312.312 = 374
c, 2550.1255 = (52)50.(53)5 = 5100.515 = 5115
d, 643.48.164 = (26)3.(22)8.(24)4 = 218.216.216 = 250
e, 38 : 36 = 32
210 : 83 = 210 : (23)3 = 210 : 29 = 2
127 : 67 = (12 : 6)7 = 27
@Dương Tuyết Mai
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Bài 3 .
a.25.(-70).2.(-4)
=[25.(-4)].[(-70).2]
=(-100).(-140)
=14000
b.16.(12-6)-12.(16-6)
=(16.12-16.6)-(12.16-12.6)
=16.12-16.6-12.16+12.6
=(16.12-12.16)-(16.6-12.6)
=0-6.(16-12)
=0-24=-24
c.125.(-24)+24.255
=24.[(-125)+255]
=24.100
=2400
d)25.(-55)+(-25).45
=25.[(-55)+(-45)]
=25.(-100)
=-2500
Bài 4
a.3x+18=3
3x =3-18
3x =-15
x =-15:3
x =-5
Vậy x=-5
b)\(4\left|x\right|=16\)
\(\left|x\right|\)=16:4
\(\left|x\right|\)=4
⇒\(\left[{}\begin{matrix}x=-4\\x=4\end{matrix}\right.\)
Vậy x∈{-4;4}
3)a)=(25.2).[(-70).(-4)]
=50.(-280)
=-14000
b)=16.6-12.10
=96-120
=-24
c)=-3000+6120
=3120
d)=1375+-1125
=250
4)a) 3x=3-18
3x=-15
x=-15:3
x=-5
b) \x\=16:4
\x\=4
suy ra x=4;-4
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câu a :
\(\dfrac{-8}{24}+\dfrac{-4}{12}=\dfrac{-1}{3}+\dfrac{-1}{3}=\dfrac{-2}{3}\)
câu b :
\(\dfrac{-20}{35}+\dfrac{16}{24}=\dfrac{-4}{7}+\dfrac{2}{3}=\dfrac{2}{21}\)
câu c :
\(\dfrac{-3}{9}+\dfrac{-6}{15}=\dfrac{-1}{3}+\dfrac{-2}{5}=\dfrac{-11}{15}\)
câu d :
\(\dfrac{3}{13}-\dfrac{4}{10}=\dfrac{3}{13}-\dfrac{2}{5}=\dfrac{-11}{65}\)
câu e :
\(\dfrac{5}{17}-\dfrac{9}{15}=\dfrac{5}{17}-\dfrac{3}{5}=\dfrac{-26}{85}\)
câu g :
\(\dfrac{9}{18}-\dfrac{6}{15}+\dfrac{3}{-9}=\dfrac{9}{18}-\dfrac{6}{15}+\dfrac{-3}{9}\\ =\dfrac{1}{2}-\dfrac{2}{5}+\dfrac{-1}{3}=\dfrac{-7}{30}\)
câu h :
\(\dfrac{5}{4}-\dfrac{1}{2}+\dfrac{-7}{8}=\dfrac{10}{8}-\dfrac{4}{8}+\dfrac{-7}{8}=\dfrac{-1}{8}\)