直接写得数．25×2= 4×500= 490÷7= 45×2= 36﹣12÷6=14×5= 78÷3= 8×9+8= 210÷3= 9×0+12=
简便计算．64×3.75+3.75×36 25×32×1.25．
用简便方法计算． 3892﹣2998= 23﹣2﹣7=4×5﹣4×4.375=
用简便方法计算 ①8.36﹣0.75﹣②99+992③×25+×10．
简算 ①56×（﹣+）②32×1.25×0.25 ③78.9×99+78.9④57.2﹣0.4﹣11.6．
脱式计算，能简算的要简算 9.81×0.1+0.5×98.1+0.049×9812÷[（2﹣1.2）×+0.05] 100﹣32×0.125×0.25 [1﹣（﹣）]×．
64×3.75+3.75×36 25×32×1.25．
﹣7
=4
×5
﹣4
×4.375=
②99+992③
×25+
×10．
﹣
+
）②32×1.25×0.25 ③78.9×99+78.9④57.2﹣0.4﹣11.6．
÷[（2
﹣1.2）×
+0.05]
﹣
）]×
．
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