解题思路:①按运算顺序计算,先算乘法,再算减法;
②运用加法交换律与结合律以及减法的性质简算;
③按运算顺序计算,先算0.8×4÷0.8×4,按运算顺序从左向右依次计算,最后算减法;
④运用乘法分配律简算;
⑤按运算顺序计算,先算除法,再按顺序从左向右依次计算;
⑥中括号内运用乘法分配律简算.
①8.82×15-100,
=132.3-100,
=32.3;
②15.8-[7/18]+14.2-[11/18],
=(15.8+14.2)-([7/18]+[11/18]),
=30-1,
=29;
③21.6-0.8×4÷0.8×4,
=21.6-3.2÷0.8×4,
=21.6-16,
=5.6;
④3×3.7+3.6+5.3×3,
=(3.7+5.3)×3+3.6,
=9×3+3.6,
=27+3.6,
=30.6;
⑤5+0.45÷0.9-1.75,
=5+0.5-1.75,
=5.5-1.75,
=3.75;
⑥1110÷[56×([3/7]-[3/8])],
=1110÷[56×[3/7]-56×[3/8]],
=1110÷[24-21],
=1110÷3,
=370.
点评:
本题考点: 小数四则混合运算;运算定律与简便运算;分数的简便计算;分数的四则混合运算.
考点点评: 考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.