1又1⼀4+(-6.5)+3又3⼀8+(-1.25)+5⼀28= 要过程!!急啊!!!!!!!!!!!!!

2025-01-05 11:51:24
推荐回答(1个)
回答1:

1又1/4+(-6.5)+3又3/8+(-1.25)+5/28
=1.25-6-1/2 +3+3/8-1.25+5/28 (消去1.25与-1.25,合并-1/2和3/8,-6和3)
=-3+1/4+5/28 (通分)
=-3+(7+5)/28
=-3+12/28
=-3+3/7
=-2又4/7