图中有几组互相垂直的线段？
组．
口算．
1
÷0.5= 1
﹣1
÷1= 1.25×
×8=
×5.6=
÷5××5= 4×0×4= 120×（
+
）=
+0.29+
=
3
﹣
﹣
=（
﹣
）×20=
直接写结果．
9×
= 3﹣
÷0.75=
+1= 2÷
=
0.9+99×0.9=
×8÷×8= 1﹣
﹣
=
﹣
=
×
×
= 42÷[14﹣（50﹣39）]=
直接写出得数．
24.06+0.4= 180×40= 7﹣3.635= 50%÷2%=
+
=
×12=
÷
= 3﹣
=
直接写出得数．
4.8×50%= 3÷30%﹣4= 88÷11%=
×40%=
9.8×20%+0.2×20%=
÷
=
×8+8×
=
÷3×÷3=
直接写出结果．
﹣
= 4.5×102=
×6= 8÷1.6= 0.42﹣0.32=
36×
= 10×10%= 7×
÷7×= 1÷
×
= 13×（2+
）=