题目内容

6.4-5.4÷2.50.76×2.5×0.40.80×1.25
18.5×5.8+5.2×18.5-18.51.2+36÷[1.44×(0.1-0.05)].
(1)6.4-5.4÷2.5,
=6.4-2.16,
=4.24;

(2)0.76×2.5×0.4,
=0.76×(2.5×0.4),
=0.76×1,
=0.76;

(3)0.80×1.25,
=0.8×1.25,
=1;

(4)18.5×5.8+5.2×18.5-18.5,
=18.5×(5.8+5.2-1),
=18.5×10,
=185;

(5)1.2+36÷[1.44×(0.1-0.05)],
=1.2+36÷[1.44×0.05],
=1.2+36÷0.072,
=1.2+500,
=501.2.
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