考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)根據(jù)減法的性質(zhì)進(jìn)行簡算;
(2)根據(jù)乘法交換律進(jìn)行簡算;
(3)根據(jù)乘法分配律進(jìn)行簡算;
(4)先算乘法,再算加法;
(5)根據(jù)加法交換律和結(jié)合律進(jìn)行簡算;
(6)根據(jù)乘法分配律以及加法結(jié)合律進(jìn)行簡算.
解答:
解:(1)1100-63.58-36.42
=1100-(63.58+36.42)
=1100-100
=1000;
(2)1.25×26×8
=1.25×8×26
=10×26
=260;
(3)
÷
-
×6
=
×6-
×6
=(
-
)×6
=
×6
=
;
(4)58×0.65+42×35%
=37.7+14.7
=52.4;
(5)
-
+
-
=(
+
)-(
+
)
=1-1
=0;
(6)(
+
)×8+
=
×8+
×8+
=
+
+
=
+(
+
)
=
+1
=2
.
點(diǎn)評(píng):考查了運(yùn)算定律與簡便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律簡便計(jì)算.