三角形的 和是180°．
直接写得数．×0= ×= ×12= ×= ÷=÷= 9×= ×= 18×= ÷=÷= ÷12=
计算 ×÷÷．
直接写出得数．÷5= ÷4= ÷2= ÷3=÷= ÷= ÷= ÷=1÷= 15÷= ÷= ÷=×= ×= += 1﹣=
先看清左右两题之间的关系，再写出得数．
= = == = == 1.05×4= 268÷14×0== 306﹣16= 5.1+0.09=
×0= 
×
= 
×12= 
×
= 
÷
=
÷
= 9×
= 
×
= 18×
= 
÷
=
÷
= 
÷12=
×
÷
÷
．
÷5= 
÷4= 
÷2= 
÷3=
÷
= 
÷
= 
÷
÷
=
= 15÷
= 
÷
= 
÷
=
×
×
= 
+
= 1﹣
=
= 
= 
=
= 
= 
=
= 1.05×4= 268÷14×0=
= 306﹣16= 5.1+0.09=
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