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)先算加法,再算除法,最后算乘法;
(2)根據(jù)乘法交換律和結(jié)合律進(jìn)行簡算;
(3)先算加法,再算除法;
(4)根據(jù)乘法分配律進(jìn)行簡算;
(5)根據(jù)乘法分配律進(jìn)行簡算;
(6)先算小括號(hào)里面的減法,再算括號(hào)外面的減法.
解答:
解:(1)
×[
÷(
+
)]
=
×[
÷
]
=
×
=
;
(2)0.125×2.5×32
=0.125×2.5×(4×8)
=(0.125×8)×(2.5×4)
=1×10
=10;
(3)
÷(
+
)
=
÷
=
;
(4)
×3.2+5.6×0.5+1.2×50%
=0.5×3.2+5.6×0.5+1.2×0.5
=0.5×(3.2+5.6+1.2)
=0.5×10
=5;
(5)58×99
=58×(100-1)
=58×100-58×1
=5800-58
=5742;
(6)28
-(10.48-8.6)
=28
-1.88
=26.72.
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.