如图，三角形ABC的面积是24，D、E和F分别是BC、AC和AD的中点．求三角形DEF的面积．
直接写出得数．1.87+5.3= 2.5×2.4= += ×=1= 7.2×= 8﹣3= 15.16+9=
0.092= 24×4%= 3.1﹣0.16﹣0.94=÷= 3.4÷0.17= ×÷×=
0.63+0.7= 3﹣1.06= = = 0.6÷6=540÷60= 0.125×16= 3.14×8= = 6=
直接写得数0.46+1.54= += 44÷= ÷80%=1.25×0.16×8= ×= 1÷0.5×2= （﹣）÷=
直接写得数（1）0.36+0.4=（2）12.5×32×2.5=（3）1÷0.9=（4）8×（12+0.5）=（5）9﹣+=（6）÷=（7）﹣=（8）1÷=（9）5+0.8=（10）6+6﹣=
+
= 
×
=
= 7.2×
= 8
=
÷
= 3.4÷0.17= 
×
×
=
= 
= 0.6÷6=
= 6
=
+
= 44÷
= 
÷80%=
×
= 1÷0.5×2= （
﹣
）÷
=
+
=
÷
=
﹣
=
=
+0.8=
=
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