计算．5＋1＋3＝ 5－3＋6＝9－6－2＝ 9－6＋7＝9－7－2＝ 6＋3－7＝7＋2－5＝ 2＋5－4＝8－3－0＝ 4－2＋5＝9－8－1＝ 10－4＋l＝
直接写出得数． = = = = = = = = = = = = = = 1﹣1%=
能简便的要用简便方法计算 12÷0.4÷； ÷9+×； 1.8×+1.2×﹣．
解方程 X﹣X= 2X+= 70%X+20%X=3.6．
直接写出得数 ÷= ×= ×= ÷= ﹣= ÷6= 0.64×= += += 18﹣= 1÷= 75%÷3=
脱式计算． 98+136÷8 26+304×6 （36+25）×7 189÷（72﹣63） 196﹣76×2 36×5+72
= 
= 
= 
= 
=
= 
= 
= 
= 
=
= 
= 
= 
= 1﹣1%=
； 
÷9+
×
+1.2×
X=
2X+
=
70%X+20%X=3.6．
÷
= 
×
= 
×
= 
÷
﹣
= 
÷6= 0.64×
= 
+
=
+
= 18﹣
= 1÷
= 75%÷3=
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