如图所示的角是 度，以A点为顶点，再在这个角内画一个60度的角．
直接写出得数．3﹣2= 1÷= 321﹣178+257=0.875÷= 409×10﹣409= 2.25+7=（+）×18= 3+2.7+2+1.3=
口算、心算我最强+ × 8.4÷0.7 470﹣72﹣28 5÷﹣ +÷+ ×× ×25% 698﹣299．
直接写出得数．28+43= 4﹣1.5= 2.5×4= 23.4÷10=1.5+6﹣1.5= 1﹣= ﹣= 4.8÷12=÷= 3.9×5×=
直接写得数．1﹣+1﹣= ﹣= 2.25×4= 0.67+0.33=÷= ×80%= （+）×12= 45%÷15%=
直接写出得数．﹣= 12﹣0.12= 5.8+8= 48+32= 32= 0÷= 4÷4%= 0.6×0.5= ×= += 1÷= +5= ．
= 1÷
= 321﹣178+257=
= 409×10﹣409= 2.25+7
+
+2.7+2
+1.3=
+
×
8.4÷0.7 470﹣72﹣28 5÷
+
×
×
×25% 698﹣299．
= 
﹣
= 4.8÷12=
= 3.9×5×
+1﹣
﹣
= 2.25×4= 0.67+0.33=
÷
= 
×80%= （
）×12= 45%÷15%=
﹣
= 12﹣0.12= 5.8+8= 48+32= 
= 4÷4%= 0.6×0.5= 
×
= 
+
= 1÷
= 
+5= ．
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