Question

a) -81 . 46 - 81 . 55 + 81

b)35 . (17-5) -17. (35-5)

c)-125 .6 .(-8) .(-50)

giải giúp mik nha

Answer 1

\(a,-81.46-81.55+81\)

\(=81.\left(-46\right)-81.55+81\)

\(=81.\left(-46-55+1\right)\)

\(=81.\left(-100\right)\)

\(=-8100\)

\(b,35.\left(17-5\right)-17.\left(35-5\right)\)

\(=35.17-35.5-17.35+17.5\)

\(=\left(35.17-17.35\right)-\left(35.5-17.5\right)\)

\(=35.\left(17-17\right)-5.\left(35-17\right)\)

\(=35.0-5.18\)

\(=0-90\)

\(=-90\)

Cách 2 : \(35.\left(17-5\right)-17.\left(35-5\right)\)

\(=35.12-17.30\)

\(=420-510\)

\(=-90\)

\(c,-125.6.\left(-8\right).\left(-50\right)\)

\(=\left(-125\right).\left(-8\right).6.\left(-50\right)\)

\(=1000.\left(-300\right)\)

\(=-300000\)