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(jiǎn)便運(yùn)算
專(zhuān)題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)(2)按照先同時(shí)算第二級(jí)運(yùn)算,再算第一級(jí)運(yùn)算順序計(jì)算解答,
(3)(4)運(yùn)用乘法分配律解答,
(5)按照先算小括號(hào)里面的,再?gòu)淖蟮接翼樞蛴?jì)算解答,
(6)按照先算小括號(hào)里面的,再算中括號(hào)里面的除法,然后算中括號(hào)里面的加法,整數(shù)括號(hào)外面的順序計(jì)算解答.
解答:
解:(1)2
×
+3
÷
=
+
=5
;
(2)4
×1.5-
÷0.24
=7-1
=5
;
(3)5
×3
+5
÷
=5
×(3
+
)
=5
×5
=25
;
(4)(
-
+
)×24
=
×24-
×24+
×24
=18-16+4
=6;
(5)(
+0.375)÷(1-
×
)×1
=
÷(1-
)×1
=
÷
×1
=
×1
=1;
(6)[1.1+7÷(3
-1
)]×1
=[1.1+7÷
]×1
=[1.1+
]×1
=5.9×1
=6.
點(diǎn)評(píng):(1)依據(jù)四則運(yùn)算計(jì)算方法正確進(jìn)行計(jì)算,(2)正確運(yùn)用簡(jiǎn)便方法解決問(wèn)題,是本題考查知識(shí)點(diǎn).