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.
(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.
=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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