用脱式计算．（除不尽时四舍五入保留两位小数）
①13.7×0.25×8 ②18﹣（1.4+1.25×2.4）
③（10.5+27.8）÷（5.2﹣2.5） ④4.2÷[8×（6.34﹣4.59）]．
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用脱式计算．（除不尽时四舍五入保留两位小数）
①13.7×0.25×8 ②18﹣（1.4+1.25×2.4）
③（10.5+27.8）÷（5.2﹣2.5） ④4.2÷[8×（6.34﹣4.59）]．
= 24%×5= 5÷5%= 6.4×
=
+
×
=
×7÷
+6×
+
= 8÷
﹣0.5=
+0.9=
×
=
÷2=
= 68÷10%=
×72%
×
÷
=
﹣
+
= 1﹣
﹣
=
×
÷
×
=（
+
）×12=
=
=
=
=
= 0×1.27=
=
=
=
=
= 1.5÷25%+1.5=
×
45×
÷10 0÷
54×
÷
×64 12÷
（
﹣
）×24 3×
÷3×
×
= 1﹣
=
÷1=
÷
=
×
= 2.5×
=
×
= 52×
=
×
÷
×
= 0÷5×
=
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