脱式计算 （能用简便方法的简便计算）
①2.07÷2.5÷0.4 ②21.36÷0.8﹣12.9
③0.125×32×2.5 ④0.65×201
⑤1.2×2.5+8×0.25 ⑥50.4×19+50.4．
脱式计算 （能用简便方法的简便计算）
①2.07÷2.5÷0.4 ②21.36÷0.8﹣12.9
③0.125×32×2.5 ④0.65×201
⑤1.2×2.5+8×0.25 ⑥50.4×19+50.4．
×
=，
×
=
和1千克棉花的
一样重． ．
+0.625=
×
=
=
﹣
=
﹣
﹣4.25=
+
﹣
+
=
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