a) \(\left(-8\right)^2.3^3=64.27=1728\)
b) \(9^2.\left(-5\right)^4=81.625=50625\)
a) Ta có: (-8)2.33 = 82.33 = (23)2. 33 = 26.33= 43. 33 = ( 4.3)3 = 123= 1728
b) Ta có: 92. (-5)4 = 92. 54 = 92 . 252 = (9 . 25)2 = 2252 = 50625
a) \(\left(-8\right)^2.3^3=64.27=1728\)
b) \(9^2.\left(-5\right)^4=81.625=50625\)
a) Ta có: (-8)2.33 = 82.33 = (23)2. 33 = 26.33= 43. 33 = ( 4.3)3 = 123= 1728
b) Ta có: 92. (-5)4 = 92. 54 = 92 . 252 = (9 . 25)2 = 2252 = 50625
Tính :
a) \(\left(-3\right).\left(-4\right).\left(-5\right)\)
b) \(\left(-5+8\right).\left(-7\right)\)
c) \(\left(-6-3\right).\left(-6+3\right)\)
d) \(\left(-4-14\right):\left(-3\right)\)
Tính :
a) \(\left(-4\right).\left(-5\right).\left(-6\right)\)
b) \(\left(-3+6\right).\left(-4\right)\)
c) \(\left(-3-5\right)\left(-3+5\right)\)
d) \(\left(-5-13\right):\left(-6\right)\)
Bài 1: Tính
a, \(22\frac{1}{2}.\frac{7}{9}+50\%-1,25\)
b,1,4\(.\frac{15}{49}-\left(\frac{4}{5}+\frac{2}{3}\right):2\frac{1}{5}\)
c,\(125\%.\left(-\frac{1}{2}\right)^2:\left(1\frac{5}{6}-1,6\right)+2016^0\)
d,1,4 .\(\frac{15}{49}-\left(20\%+\frac{2}{3}\right):2\frac{1}{5}\)
đ,125%.\(\left(\frac{1}{2}\right)^2:\left(1\frac{5}{6}-1,5\right)+2016^0\)
Bài 2 Tìm x biết
a,\(\left|\frac{3}{4}.x-\frac{1}{2}\right|=\frac{1}{4}\)
b, \(\frac{5}{3}.x-\frac{2}{5}.x=\frac{19}{10}\)
c, \(\left|2.x-\frac{1}{3}\right|=\frac{2}{9}\)
d, x-30%.x=-1\(\frac{1}{5}\)
Tính :
a) \(\left(-7\right)^3.2^4\)
b) \(5^4.\left(-4\right)^2\)
Tìm số nguyên a, biết :
a) \(\left|a\right|=4\)
b) \(\left|a\right|=0\)
c) \(\left|a\right|=-3\)
d) \(\left|a\right|=\left|-8\right|\)
e) \(-13.\left|a\right|=-26\)
Tính (một cách hợp lí) :
a) \(18.17-3.6.7\)
b) \(54-6.\left(17+9\right)\)
c) \(33.\left(17-5\right)-17.\left(33-5\right)\)
Tính bằng hai cách :
a) \(15.12-3.5.10\)
b) \(45-9.\left(13+5\right)\)
c) \(29.\left(19-13\right)-19.\left(29-13\right)\)
Tính:
a) \(\dfrac{-5}{6}+\dfrac{1}{6}\)
b) \(\dfrac{1}{3}-\dfrac{5}{4}.\dfrac{4}{15}\)
c) \(4.\left(-5\right)^2+\left(-2\right)^3.25\)
d) \(\dfrac{-2}{7}+\dfrac{1}{5}:\dfrac{7}{15}\)
Tính các tổng sau :
a) \(\left[\left(-13\right)+\left(-15\right)\right]+\left(-8\right)\)
b) \(500-\left(-200\right)-210-100\)
c) \(-\left(-129\right)+\left(-119\right)-301+12\)
d) \(777-\left(-111\right)-\left(-222\right)+20\)