向阳村为了抗旱，需要从河边铺设水管把水引到村里（如图）．（1）怎样铺设水管最节约材料，请在图上画出路线．（2）量取所需数据，求出向阳村到河边所铺水管的实际长度．
直接写得数． 25%×8=﹣= 4.8÷0.8= 12×（+）=
口算． 24×75%= 5.2÷1.3==×= 3÷= 3.1﹣0.3= 0.92= 4.2+÷0.5===
直接写出计算结果． 2.6×0.3= 43÷10%= 0.32﹣0.23=+= 4﹣=﹣= 1.3×7+6.7×7=×5÷×5=
直接写得数． 8×3.14=0.43= 0.125×8= 1﹣= 9÷= 1÷0.25=﹣=+=
口算 6×0.03= 1÷0.25= 8÷1.6= 1﹣0.3×0.6= 43÷0.01= 300×0.04= 14﹣1.4= 1.3×0.5= 0.42÷0.6= 7﹣1.4= 12﹣1.2= 2.5+2.5×3= 9÷0.01= 43÷0.1= 8.4÷4= 3.9﹣3.9÷3=+= 2﹣=﹣=++=
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= 1.3×7+6.7×7=
×5=
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= 1÷0.25=
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= 2﹣
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