考點(diǎn):整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)四則混合運(yùn)算,運(yùn)算定律與簡便運(yùn)算,小數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡算
分析:(1)根據(jù)乘法分配律進(jìn)行解答.
(2)先算括號(hào)里面的減法,再算除法,最后算加法.
(3)先算除法,再根據(jù)加法交換律進(jìn)行計(jì)算.
(4)先算括號(hào)里面的,再算乘法和除法.
(5)根據(jù)減法的性質(zhì)進(jìn)行計(jì)算.
(6)把97變成98-1,再根據(jù)乘法分配律進(jìn)行計(jì)算.
解答:
解:(1)
×
-0.125×0.5
=
×(
-0.5)
=
×=
;
(2)3.2+(9.2-3.8)÷
=3.2+5.4÷
=3.2+10.8
=14;
(3)
+
÷
+
=
+
+
=
+
+=1
;
(4)(
+0.2)×
÷(3-0.5)
=
×
÷=
××=
;
(5)17.6-8.2-2.8
=17.6-(8.2+2.8)
=17.6-11
=6.5;
(6)97×
=(98-1)×
=98×
-
=95-
=94
.
點(diǎn)評(píng):本題主要考查了學(xué)生四則運(yùn)算的計(jì)算能力,及在運(yùn)算中靈活運(yùn)用簡便方法進(jìn)行計(jì)算的能力.