遞等式計(jì)算,能簡(jiǎn)便的用簡(jiǎn)便方法計(jì)算
5.41+3.46-2.46                     2.03-0.18-2.82+7.97 10-4.44-5.56                    
32.63+7.89-6.4 125×25×32                       97×88.
分析:(1)根據(jù)加法結(jié)合律進(jìn)行計(jì)算;
(2)根據(jù)加法交換律和結(jié)合律以及連減的性質(zhì)進(jìn)行計(jì)算;
(3)根據(jù)連減的性質(zhì)進(jìn)行計(jì)算;
(4)先算加法,再算減法;
(5)根據(jù)乘法交換律和結(jié)合律進(jìn)行計(jì)算;
(6)根據(jù)乘法分配律進(jìn)行計(jì)算.
解答:解:
(1)5.41+3.46-2.46,
=5.41+(3.46-2.46),
=5.41+1,
=6.41;

(2)2.03-0.18-2.82+7.97,
=(2.03+7.97)-(0.18+2.82),
=10-3,
=7;

(3)10-4.44-5.56,
=10-(4.44+5.56),
=10-10,
=0;

(4)32.63+7.89-6.4,
=40.52-6.4,
=34.12;

(5)125×25×32,
=125×25×(8×4),
=(125×8)×(25×4),
=1000×100,
=100000;

(6)97×88,
=(100-3)×88,
=100×88-3×88,
=8800-264,
=8536.
點(diǎn)評(píng):四則運(yùn)算,先弄清運(yùn)算順序,然后再進(jìn)一步計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算.
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