直接写得数．0.28+0.2= 0.6+0.3= 8.8﹣0.5=0.88﹣0.08= 1﹣0.69= 3.4+5.6=0.38+5.52= 5﹣3.4=
++++﹣﹣++﹣﹣ 1﹣++﹣．
计算：= 1﹣====== 1﹣===
+ =﹣ = = 改正：
用推算计算 （1）+= （2）﹣=
计算： 2.5×40= 18×6= 1.73+2.07= 10﹣0.9= 400÷4=+=﹣=+=﹣=﹣=
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