脱式计算45×24﹣420÷7 56﹣42×2÷28 （27+54）÷（171÷19） 81×（9﹣6÷3）
直接写出得数．= = = = == = = = =
直接写出得数：2.4×= ； = ； ：0.75= ； ÷ =0.1；0.180%×= ； 32÷（1+60%）= ； 2﹣1= ； ×40=．
= = = == = = =
直接写得数．÷3= 10÷= ÷= ×=÷= ×= 4×= 1﹣=×60= ×= ×= ××=÷5= 30÷= ÷= ×÷=
直接写出得数．16×= ×= ×= ÷=÷= 9÷= ××=
= 
= 
= 
= 
=
= 
= 
= 
= 
=
= ； 
= ； 
：0.75= ； 
÷ =0.1；
= ； 32÷（1+60%）= ； 2﹣1
= ； ×40=
．
= 
= 
= 
=
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=
÷3= 10÷
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÷
= 
×
=
÷
= 
×
= 4×
= 1﹣
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×60= 
×
= 
×
×
×
=
÷5= 30÷
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÷
= 
×
÷
=
= 
×
= 
×
= 
÷
=
÷
= 9÷
= 
×
×
=
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