-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

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-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
-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

-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
-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