计算下面各题，能用简便算法的用简便算法
3.045+2.7×6.9=18.94﹣2.5×4=
3.65×2.8+3.65×7.2=13.54×102﹣2×13.54=
选择合适的方法计算
①7.8÷0.26÷0.3 ②5.4+4.6÷0.2 ③1.43×2.5+0.57×2.5 ④10.8÷0.27×4．
计算下面各题，怎样简便就怎样算．
（1）45.36÷7.2﹣2.5×0.2（2）5.12﹣（4.65﹣4.88）
（3）2.7÷4+6.3×0.5（4）9.43×1.1
（5）0.25×12.5×3.2（6）30.8×0.35+6.5×3.08．
计算：
7.5×46.7+52.3×7.5+7.5；（
+
+
﹣
）×24；（2.5﹣2.5×0.6）÷0.4；
﹣（
+2.4×
）÷
；1.2+[2
÷（2﹣2.4×
）]；
=
．
脱式计算．
①2.7+3.1+2.9+3.2②0.44×8.3+8.3×0.56
③12.53﹣1.35×2﹣9.3④25×32×0.5．
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= 2.5÷
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