-1.3×2/3+0.34×2/7+1/3×(-1.3)+1又5/7×0.34用有理数的简算
问题描述：
-1.3×2/3+0.34×2/7+1/3×(-1.3)+1又5/7×0.34用有理数的简算
答
-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+0.34
= -12.66