在图中再画一个与阴影部分的三角形面积相等的三角形，并算出它的面积．
口算×15=×2=×=×=÷=÷3=÷5=÷=
画一画． （1）= （2）÷4=
直接写结果：×3= 1÷= 1﹣﹣=×= 3﹣4×=×12=÷=+= 1﹣﹣=﹣=
直接写出得数×3=×=﹣0.25= 72×=÷=÷= 36÷=÷=
直接写得数．×16= 12÷= 0.3×=÷= 1÷= 0×===
×15=
×2=
×
=
×
=
÷
=
÷3=
÷5=
÷
=
=
÷4=
×3= 1÷
= 1﹣
﹣
×
= 3﹣4×
=
×12=
÷
=
+
= 1﹣
﹣
=
﹣
=
×3=
×
=
﹣0.25= 72×
=
÷
=
÷
= 36÷
=
÷
=
×16= 12÷
= 0.3×
=
÷
= 1÷
= 0×
=
=
=
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