6.175
分析:根據(jù)題意可知6條線段的長度之和就是:(
+0.875)+(
+
)+(
+0.6)+(0.875+
)+(0.875+0.6)+(
+0.6);然后根據(jù)乘法的意義進行化簡求解.
解答:(
+0.875)+(
+
)+(
+0.6)+(0.875+
)+(0.875+0.6)+(
+0.6),
=
×3+0.875×3+
×3+0.6×3,
=1+2.625+0.75+1.8,
=3.625+0.75+1.8,
=4.375+1.8,
=6.175;
答:圖上六條線段的長度之和是6.175.
故答案為:6.175.
點評:本題關(guān)鍵是理解題意找出求和的方法,然后根據(jù)乘法的意義:求幾個相同加數(shù)和的簡便運算進行簡算.