14.6×3.8-3.8×4.653+79+47+121
數(shù)學(xué)公式×數(shù)學(xué)公式+數(shù)學(xué)公式×數(shù)學(xué)公式2.5×(4+0.3)
12×(數(shù)學(xué)公式+數(shù)學(xué)公式-數(shù)學(xué)公式數(shù)學(xué)公式×(數(shù)學(xué)公式+0.3)
956-5.8-4.268.6×28+31.4×28.

解:①14.6×3.8-3.8×4.6,
=(14.6-4.6)×3.8,
=38;

②53+79+47+121,
=(53+47)+(121+79),
=100+200,
=300;

×+×,
=
=1;

④2.5×(4+0.3),
=2.5×4+2.5×0.3,
=10+0.75,
=10.75;

⑤12×(+-),
=12×+12×-12×
=8+6-3,
=11;

×(+0.3),
=+
=1+,
=1;

⑦956-5.8-4.2,
=956-(5.8+4.2),
=956-10,
=946;

⑧68.6×28+31.4×28,
=(68.6+31.4)×28,
=100×28,
=2800;
分析:①④⑤⑥⑧運(yùn)用乘法的分配律進(jìn)行計算即可.
②運(yùn)用加法的結(jié)合律及交換律進(jìn)行計算即可.
③根據(jù)四則混合運(yùn)算的運(yùn)算順序計算即可.
⑦據(jù)減法性質(zhì)進(jìn)行計算.
點(diǎn)評:完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡便方法計算.
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