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3-2.78-0.22101×99-990.32×6.7+3.2×0.33[数学公式-(数学公式+数学公式)]÷数学公式

解:(1)3-2.78-0.22,
=3-(2.78+0.22),
=3-3,
=0;

(2)101×99-99,
=(101-1)×99,
=100×99,
=9900;

(3)0.32×6.7+3.2×0.33,
=0.32×6.7+0.32×3.3,
=0.32×(6.7+3.3),
=0.32×10,
=3.2;

(4)[-(+)]÷
=[--
=(-)÷
=
=
分析:(1)根据减法的性质简算;
(2)(3)运用乘法分配律简算;
(4)先根据减法的性质简算,计算出括号外的运算,再算括号外的除法.
点评:本题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进行简便计算.
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