题目内容

0.7×14.5-4.8   1.2×4.5×3.1     8.75+1.6×5.2
(16.47-3.5)×0.4    14.6-5×0.24   4.76×(3.5+4.2)
4.2×5.3+6.54 32.7-6.4×0.8 3.7×(10-5.2)
分析:(1)(5)(8)先算乘法,再算减法;
(2)从左往右依次运算;
(3)(7)先算乘法,再算加法;
(4)(6)(9)先算括号内的,再算括号外的.
解答:解:(1)0.7×14.5-4.8,
=10.15-4.8,
=5.35;

(2)1.2×4.5×3.1,
=5.4×3.1,
=16.74;

(3)8.75+1.6×5.2,
=8.75+8.32,
=17.07;

(4)(16.47-3.5)×0.4,
=12.97×04,
=5.188;

(5)14.6-5×0.24,
=14.6-1.2,
=13.4;

(6)4.76×(3.5+4.2),
=4.76×7.7,
=36.652;

(7)4.2×5.3+6.54,
=22.26+6.54,
=28.8;

(8)32.7-6.4×0.8,
=32.7-5.12,
=27.58;

(9)3.7×(10-5.2),
=3.7×4.8,
=17.76.
点评:解答此题,关键是掌握运算顺序以及运算法则.
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