a)
\(\left(-8537\right)+\left(1975+8537\right)\)
\(=\left(-8537\right)+1975+8537\)
\(=1975\)
b)
\(\left(35-17\right)+\left(17+20-35\right)\)
\(=35-17+17+20-35\)
\(=20\)
c)
\(273+\left[-34+27+\left(-273\right)\right]\)
\(=273-34+27-273\)
\(=27-34\)
\(=-7\)
a)\(\left(-24\right).17+\left(-35\right).24+\left(-24\right).48\)
b)\(145+\left(27-145\right)-100+27\)
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 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) \(777-\left(-111\right)-\left(-222\right)+20\)
Rút gọn: B = \(\left(1-\dfrac{1}{2}\right).\left(1-\dfrac{1}{3}\right).\left(1-\dfrac{1}{4}\right)....\left(1-\dfrac{1}{20}\right)\)
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) \(\left(-5-13\right):\left(-6\right)\)
Tính các tổng sau :
a) \(\left[\left(-8\right)+\left(-7\right)+\left(-10\right)\right]\)
b) \(555-\left(-333\right)-100-80\)
c) \(-\left(-229\right)+\left(-219\right)-401+12\)
d) \(300-\left(-200\right)-\left(-120\right)+18\)
Tìm số nguyên \(x\) biết :
a) \(2x-35=15\)
b) \(3x+17=2\)
c) \(\left|x-1\right|=0\)
\(\left(57-725\right)-\left(605-53\right)\)
\(-452-\left(-67+75-452\right)\)
\(\left(55+45+15\right)-\left(15-55+45\right)\)