Tính :
a) (-2) . (-7) . (-5)
= 14 . (-5)
= -70
b) 15 - 22 + ( -17 )
= (-7) + (-17)
= -24
c) 25 . (-4) - 20 . (-5)
= (-100) - (-100)
= 0
d) 185 - ( 49 + 185 )
= 185 - 234
= -49
e) (-19) . (-13) + 13 . (-29)
= 247 + -377
= -130
a) (-2) . (-7) . (-5)
= 14 . (-5)
= -70.
b) 15 - 22 + (-17)
= (-7) + (-17)
=-24.
c)25. (- 4) – 20. (- 5)
= (-100) - (-100)
= (-100) + 100
= 0
d) 185 – (49 + 185)
= 185 - 234
= (-49).
e) ( -19 ) . (- 13) + 13 . (-29)
= 247 + ( -377).
= ( -130)
\(a,\left(-2\right).\left(-7\right).\left(-5\right).\)
\(=\left[\left(-2\right).\left(-5\right)\right].\left(-7\right).\)
\(=10.\left(-7\right)=\left(-70\right).\)
\(b,15-22+\left(-17\right).\)
\(=\left(-7\right)+\left(-17\right)=\left(-24\right).\)
\(c,25.\left(-4\right)-20.\left(-5\right).\)
\(=\left(-100\right)-\left(-100\right)=\left(-100\right)+100=0.\)
\(d,185-\left(49+185\right).\)
\(=185-49-185.\)
\(=\left(185-185\right)-49.\)
\(=0-49=\left(-49\right).\)
\(e,\left(-19\right).\left(-13\right)+13.\left(-29\right).\)
\(=\left(-19\right).\left(-13\right)+\left(-13\right).29.\)
\(=\left[\left(-19\right)+29\right]\left(-13\right).\)
\(=10.\left(-13\right)=\left(-130\right).\)
~ Học tốt ~
