-13×2⼀3–0.34×2⼀7+1⼀3×(-13)–5⼀7×0.34怎么脱式计算

2025-05-08 19:48:45
推荐回答(2个)
回答1:

-13×2/3–0.34×2/7+1/3×(-13)–5/7×0.34=-13×2/3-1/3×13–0.34×2/7–5/7×0.34
=13×(-2/3-1/3)+0.34×(-2/7-5/7)=-13-0.34=-13.34

回答2:

-13×2/3–0.34×2/7+1/3×(-13)–5/7×0.34
=-13×(2/3+1/3)-0.34×(2/7+5/7)
=-13×1-0.34×1
=-13-0.34
=-13.34