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（0.1+0.12+0.123+0.124)乘(0.12+0.123+0.1234+0.12345)-(0.1+0.12+0.123+0.1234+0.12345)乘(0.12+0.123+0.1234)这题怎么做,要用拖式计算,还要写明解题思路
题目详情
（0.1+0.12+0.123+0.124)乘(0.12+0.123+0.1234+0.12345)-(0.1+0.12+0.123+0.1234+0.12345)乘(0.12+0.123+0.1234)这题怎么做,要用拖式计算,还要写明解题思路
▼优质解答
答案和解析
原式=（0.1+0.12+0.123+0.1234）*(0.12+0.123+0.1234)+(0.1+0.12+0.123+0.1234)*0.12345-(0.1+0.12+0.123+0.1234)*(0.12+0.123+0.1234)-0.12345*(0.12+0.123+0.1234)
=0.1*0.12345
=0.012345
=0.1*0.12345
=0.012345
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