题目内容
列式计算.
(1)用14.81与5.19的和,乘以2,积是多少?
(2)126.8与15.7的和,乘以1.02,积是多少?
(3)0.6 乘0.8的积,加上0.12后,再除以1.2,商是多少?
(1)用14.81与5.19的和,乘以2,积是多少?
(2)126.8与15.7的和,乘以1.02,积是多少?
(3)0.6 乘0.8的积,加上0.12后,再除以1.2,商是多少?
分析:(1)用14.81加上5.19的和乘以2,先求出和再乘以2.
(2)126.8加上15.7的和,再乘以1.02,即可得到积.
(3)用0.6乘以0.8的积再加上0.12求出和,用和除以1.2即可.
(2)126.8加上15.7的和,再乘以1.02,即可得到积.
(3)用0.6乘以0.8的积再加上0.12求出和,用和除以1.2即可.
解答:解:(1)(14.81+5.19)×2,
=20×2,
=40;
答:积是40.
(2)(126.8+15.7)×1.02,
=142.5×1.02,
=145.35;
答:积是145.35.
(3)(0.6×0.8+0.12)÷1.2,
=0.6÷1.2,
=0.5;
答:商是0.5.
=20×2,
=40;
答:积是40.
(2)(126.8+15.7)×1.02,
=142.5×1.02,
=145.35;
答:积是145.35.
(3)(0.6×0.8+0.12)÷1.2,
=0.6÷1.2,
=0.5;
答:商是0.5.
点评:首先弄清题意,按照题目的要求的运算顺序列式解答即可.
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