考點(diǎn):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)乘法分配律進(jìn)行簡(jiǎn)算;
(2)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(3)先算小括號(hào)里面的減法,再算除法,再算乘法,最后算括號(hào)外面的減法;
(4)按照從左向右的順序進(jìn)行計(jì)算.
解答:
解:(1)37.5%×637+
×363=0.375×637+0.375×363
=0.375×(637+363)
=0.375×1000
=375;
(2)1.314×998
=1.314×(1000-2)
=1.314×1000-1.314×2
=1314-2.628
=1311.372;
(3)9.5-[(2.5-
)÷1
]×
=9.5-[2
÷1
]×
=9.5-
×
=9.5-
=9.125;
(4)
×
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×
=
×
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×
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=
.
點(diǎn)評(píng):考查了運(yùn)算定律與簡(jiǎn)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(jiǎn)便計(jì)算.