早教吧 育儿知识 作业答案 考试题库 百科 知识分享

计算:(1)12.5×111-1.5×25=.(2)49.2492492÷1.23123123=.(3)(0.3+0.5)÷0.25×1.2=.

题目详情
计算:
(1)12.5×111-1.5×25=______.
(2)49.2492492÷1.23123123=______.
(3)(0.3+0.5)÷0.25×1.2=______.
▼优质解答
答案和解析
(1)12.5×111-1.5×25,
=12.5×111-3×12.5,
=(111-3)×12.5,
=(100+8)×12.5,
=100×12.5+8×12.5,
=1250+100,
=1350;
(2)49.2492492÷1.23123123,
=(49.2492492×4)÷(1.23123123×4),
=49.2492492÷(1.23123123×4)×4,
=49.2492492÷4.92492492×4,
=10×4,
=40;
(3)(0.3+0.5)÷0.25×1.2,
=0.8÷0.25×1.2,
=3.2×1.2,
=3.84.
故答案为:1350,40,3.84.