\(\left(-125\right)\cdot\left(-14\right)\cdot\left(-8\right)\cdot\left(-3\right)\)
\(=\left[\left(-125\right)\cdot\left(-8\right)\right]\cdot\left[\left(-14\right)\cdot\left(-3\right)\right]\)
\(=\left(125\cdot8\right)\cdot\left(14\cdot3\right)\)
\(=1000\cdot42\)
\(=42000\)
(-14) . (-125) . (+3) . (-8)
Tính bằng cách hợp lý:
a) ( − 125 ) . ( − 5 ) .8. ( − 2 )
b) ( − 127 ) . ( 1 − 582 ) − 582.127
c) ( 43 − 13 ) . ( − 3 ) + 27. ( − 14 − 16 )
d) 125. ( − 61 ) . ( − 2 ) 3 . ( − 1 ) 2 n ( n ∈ ℕ * )
D=5^10×7^3+25^8×49^2/(125)^3+5^9×14^3
Tính nhanh.
a) (-4).(-8).(-17).(-25).125
b) (236 – 362) – (638 + 463)
c) (- 325 – 147) – ( - 625 + 853) – (-96)
d) 69.(- 47) – 31. (- 47)
e) 98. (- 37) + (- 49).126
f) – 35. (49 – 125) – 125 .(35 – 49)
g) 2 + 4 – 6 – 8 + 10 + 12 – 14 – 16 + …+ 90 + 92 – 94 – 96
h) 1 + 3 + 3 2 + 3 3 + ….+ 3 50
Tìm x,biết:
A) 8 + ( x - 9)= 125 - 64
B) 5×(x+7) -10 = 8×5
C) 7 × 7 - 7( 13 - 2× x) = 14
D) 320 : (x - 1) = ( 125 - 5 ×5 ) : 4 + 15
E) 240 : ( x -5 ) = 4 × 5 ×5 - 60 : 3
F) 49 × x - 14 × x = 49 × 10 - 70
tính:
a,17-11-14-(-39)
b,125-4[3-7(-2)]
c, (-2)^7:(-2)^4+8
d,(-14).9-13.(-9)
a) 2/5+3/5:(3/5+(-2/3))-7/2=?
b)(6-14/5)×25/8-8/5:1/4=?
c) 125%(-1/2) mũ 2 :(21/16-1,5)+2016 mũ 0
Bài 3: Tính nhẩm:
a) 9 . 24 . 25 ;
b) 12 . 125 . 54 ;
c) 64 . 125 . 875 ;
d) 425 . 7 . 4 – 170 . 60 ;
e) 8 . 9 . 14 6 . 17 . 12 19 . 4 . 18.
bài 5:
ví dụ : 100.10\(^2\)=10\(^2\)=100
a, 4.8.2\(^{15}\) b, 9\(^{12}\).3\(^{14}\) c, 25\(^8\).5\(^9\) d, 9\(^6\).27\(^5\)
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