能簡算的要簡算.
15.6-8.9+5.67.02+3.8+3.98+2.268.4-(4.7+8.4)
35.8-(40-44.2)100-13.72-36.8247.35+16.88-7.35.

解:(1)15.6-8.9+5.6,
=6.7+5.6,
=12.3;

(2)7.02+3.8+3.98+2.2,
=(7.02+3.98)+(3.8+2.2),
=11+6,
=17;

(3)68.4-(4.7+8.4),
=68.4-8.4-4.7,
=60-4.7,
=55.3;

(4)35.8-(40-44.2),
=35.8-40+44.2,
=35.8+44.2-40,
=80-40,
=40;

(5)100-13.72-36.82,
=100-(13.72+36.82),
=100-50.54,
=49.46;

(6)47.35+16.88-7.35,
=47.35-7.35+16.88,
=40+16.88,
=56.88.
分析:(1)按照從左到右的順序計算;
(2)運用加法交換律和結(jié)合律簡算;
(3)根據(jù)減法的性質(zhì)簡算;
(4)先去掉括號,再根據(jù)加法交換律簡算;
(5)根據(jù)減法的性質(zhì)簡算;
(6)運用加法交換律簡算.
點評:本題考查了四則混合運算,注意運算順序和運算法則,靈活運用所學(xué)的運算定律進(jìn)行簡便計算.
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