分析:①125×3..2×2.5把3.3拆成8×0.4,再利用乘法的結(jié)合律計算;
②3.6×10.1把10.1拆成10+0.1,再利用乘法的分配律計算;
③5.8×2.7+0.58×73把0.58×73變成5.8×7.3,再利用乘法的分配律計算;
④先算乘,再算加;
⑤兩個括號同時計算,再算除;
⑥先算括號里,再利用乘法的分配律計算.
解答:解:①125×3.2×2.5,
=125×8×0.4×2.5,
=(125×8)×(0.4×2.5),
=1000×1,
=1000;
②3.6×10.1,
=3.6×(10+0.1),
=3.6×10+3.6×0.1,
=36+0.36,
=36.36;
③5.8×2.7+0.58×73,
=5.8×2.7+5.8×7.3,
=5.8×(2.7+7.3),
=5.8×10,
=58;
④3.6+6.4×1.8,
=3.6+11.52,
=15.12;
⑤(1.48+3.02)÷(3.6×0.5),
=4.5÷1.8,
=2.5;
⑥(36.7-4.9)×101-31.8,
=31.8×101-31.8,
=31.8×(101-1),
=31.8×100,
=3180.
點評:考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學(xué)的運算律簡便計算.