题目内容

脱式计算
8.9×2.7×1.1  
8.25×3.4+6.9   8.95×36-40.74
12.8×0.5+6.43   3.9×5.4-2.84   22-1.6×6.
分析:(1)按照从左向右的顺序进行计算;
(2)先算乘法,再算加法;
(3)先算乘法,再算减法;
(4)先算乘法,再算加法;
(5)先算乘法,再算减法;
(6)先算乘法,再算减法.
解答:解:(1)8.9×2.7×1.1,
=24.03×1.1,
=26.433;

(2)8.25×3.4+6.9,
=28.05+6.9,
=34.95;

(3)8.95×36-40.74,
=322.2-40.74,
=281.46;

(4)12.8×0.5+6.43,
=6.4+6.43,
=12.83;

(5)3.9×5.4-2.84,
=21.06-2.84,
=18.22;

(6)22-1.6×6,
=22-9.6,
=12.4.
点评:此题主要考查小数的四则混合运算的运算顺序,然后根据运算顺序进行计算.
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