分析:(1)按從左到右的運(yùn)算順序依次進(jìn)行計(jì)算即可;
(2)先算乘法,再算加減即可;
(3)先算括號里面的,再算乘方、除法,最后算加減;
(4)先算括號里面的,再算乘方,最后算加減即可;
(5)先把-99
化為(-100+
)的形式,再根據(jù)乘法分配律把每一項(xiàng)分別同14相乘即可.
解答:解:(1)-8-12+2,
=-20+2,
=-18;
(2)0.5+
()-(-2.75)+(+
),
=0.5+0.25+2.75+0.5,
=(0.5+0.5)+(0.25+2.75),
=1+3,
=4;
(3)
-32-[(-)+(-)]÷
,
=-9+[(-
)×12+(-
)×12],
=-9+[(-8)+(-3)],
=-9-11,
=-20;
(4)
-32-[(-)+(-)],
=-9-(-
-
),
=-9-(-
-
),
=-9-(-
),
=-9+
,
=-8
;
(5)
-99×14,
=(-100+
)×14,
=-100×14+
×14,
=-1400+4,
=-1396.
點(diǎn)評:本題考查的是有理數(shù)的運(yùn)算能力.注意:(1)要正確掌握運(yùn)算順序,即乘方運(yùn)算(和以后學(xué)習(xí)的開方運(yùn)算)叫做三級運(yùn)算;乘法和除法叫做二級運(yùn)算;加法和減法叫做一級運(yùn)算;
(2)在混合運(yùn)算中要特別注意運(yùn)算順序:先三級,后二級,再一級;有括號的先算括號里面的;同級運(yùn)算按從左到右的順序;
(3)能用運(yùn)算定律簡便運(yùn)算的要簡便運(yùn)算.