mak trước khi hỏi ngươi tra mạng trước cho nhanh
a)\(210+ \left[46+\left(-210\right)+\left(-260\right)\right]\)
=\(210+46+\left(-210\right)+\left(-260\right)\)
=\(\left[210+\left(-210\right)\right]+\left[46+\left(-260\right)\right]\)
=\(0+\left(-164\right)\)
\(=-164\)
b)\(\left(-8\right)-\left[\left(-5\right)+8\right]\)
\(=\left(-8\right)-\left(-5\right)-8\)
\(=\left[\left(-8\right)-8\right]-\left(-5\right)\)
\(=\left(-16\right)-\left(-5\right)\)
\(=-11\)
c)\(25.134+25.\left(-34\right)\)
\(=25\left(100+34\right)+25.\left(-34\right)\)
\(=2500+25.34+25\left(-34\right)\)
\(=2500+25\left[34+\left(-34\right)\right]\)
\(=2500+25.0\)
\(=2500+0\)
\(=2500\)