13*(-7)
(-8)*(-25)
25*(47)*(-4)
8.(125-3000)
Tính
13.(-7)
(-8).(-25)
25.(-47).(-4)
8.(125-3000)
512.(2-128)-128.(-512)
13 . ( - 7 ) = - 91
( - 8 ) . ( - 25 ) = 200
25 . ( - 47 ) . ( - 4 ) = ( - 100 ) . ( - 47 ) = 4700
8 . ( 125 - 3000 ) = 8 . 125 - 3000 = 1000 - 3000 = - 2000
512 . ( 2 - 128 ) - 128 . ( - 512 ) = 512 . ( 2 - 128 + 128 ) = 512 . 2 = 1024
13 x (-7) = -91
(-8) x (-25) = 200
25 x (-47) x (-4) = 4700
8 x (125 - 3000) = -23000
512 x (2 - 128) - 128 x (-512) = 1024
Nếu sai thì thôi
Học tốt!!!
a 12 – 34 b 23 – 47 c 31 – 23 d 9 – 5 e 4 – 15 25 f 23 13 17 57 g 4 . 9 6 . 12 – 7 h 14 6 19 14 19 i 56 – 8. 27 7 j 8 5 . 2 – 3 6 k 4 . 3 125 . 25 8 l 9 6 . 3 – 4 7 m 45. 18 – 15 – 18. 45 – 15
Tách từng câu ra giùm, như này ai giải nổi:)))))
Bài 1.Thực hiện phép tính:
a) 25. 12 b) 34. 11 c) 47. 101 f) 4. 36. 25. 50
d) 5. 125. 2. 41. 8 e) 25. 7. 10. 4
a) \(=300\)
b) \(=374\)
c) \(=4747\)
d) \(=180000\)
tính
a, 13.(-7) d, 8.(125-3000)
b, (-8).(-25) e, 512.(2-128)-128.(-512)
c, 98-(x+4)=20 f, 66.25+5.66+66.14+33.66
g, 12.35+35.182-35.94 h, (-8537)+(1975+8537)
i, (35-17)+(17+20-35)
a: \(13\cdot\left(-7\right)=-91\)
b: \(\left(-8\right)\cdot\left(-25\right)=200\)
c: =>x+4=98-20=78
hay x=74
g: \(=35\left(12+182-94\right)=35\cdot100=3500\)
h: \(=-8537+1975+8537=1975\)
4) 87+(-45)-(-79)
5) (-15)+45-62
6) 120: (-5)+72
7) -147-130: (-13)
8) 125. (-8) : (-25). (-7)
9) 25-18+(-43)
10) -18-3.(-20)
4) 121
5) - 32
6) 48
7) - 137
8) - 280
9) - 36
10) 42
4) 41
5) -32
6) 48
7) -137
8) -280
9) -36
10) 42
tính nhanh
a, 4*125*25*8
b,2*3*4*5*50*25
c,8*427*3+6*573*4
d,54*47-47*53-20-27
e,100-47*72-47*28
tính nhanh
a/[25-(-75)]+32-(32+55)
b/25.17.(-4).125.(-8)
c/(-14).9-13.(-9)
d/37.90-37.(-10)
e/29.(100-47)+85.(47-29)
f/47.(23+50)-23.(47+50)
g/45-5.(17+9)-17.(-15)
h/(-8).(-25)+52.23
tính nhanh
a/[25-(-75)]+32-(32+55)
b/25.17.(-4).125.(-8)
c/(-14).9-13.(-9)
d/37.90-37.(-10)
e/29.(100-47)+85.(47-29)
f/47.(23+50)-23.(47+50)
g/45-5.(17+9)-17.(-15)
h/(-8).(-25)+52.23
a/[25-(-75)]+32-(32+55)
=[25+75]+32-(32+55)
=25+75+32-32-55
=[25+75]+[32-32]-55
=100+0-55
=100-55
=45
\(\dfrac{8^{15}.25^7}{125^5.2^{47}}\)
\(\dfrac{8^{15}.25^7}{125^5.2^{47}}=\dfrac{\left(2^3\right)^{15}.\left(5^2\right)^7}{\left(5^3\right)^5.2^{47}}=\dfrac{2^{45}.5^{14}}{5^{15}.2^{47}}\)
\(\dfrac{2^{45}.5^{14}}{2^{47}.5^{15}}=\dfrac{1.1}{4.5}=\dfrac{1}{20}\)