直接写得数 3.2﹣0.7= 0.45+1.08= 1﹣0.09= 0.72÷0.9=5X+2X= 8.5a﹣2.7a= 0.6×0.4×2.5= 31.4÷0.314=
3.7×0.172+0.37×8.28．
6.4×4.2+4.2×4.6﹣4.2．
能简算的要简算1.6×240﹣16×14 83.3﹣4.14﹣5.86 ×9﹣×6 ﹣（+）÷．
÷4+×．
×5.3﹣+3.7×．
×9﹣
﹣（
+
）÷
．
÷4+
×
×5.3﹣
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