五（1）班有48本童话书，是科技书的3倍．科技书有多少本？
×1= 52﹣42= 0.75﹣0.5= ×= ÷= 125×0.08=0.5+0.02= ÷= ÷= 0.15×6= 12÷0.3= 0÷=
直接写得数．×16= 12÷= 24×= ×÷=1÷= ÷15= ÷= ×÷×=
口算我最棒= 26×= = = == = = 6.4÷20%= 125%×8=
直接写得数．10÷= ÷= ×= 55×÷=×2= 1÷= ÷= 0×+=
口算×15= ×2= ×= ×=÷= ÷3= ÷5= ÷=
×1= 52﹣42= 0.75﹣0.5= 
= 
÷
= 125×0.08=
÷
= 0.15×6= 12÷0.3= 0÷
=
×16= 12÷
= 24×
= 
×
÷
= 
÷15= 
÷
= 
×
÷
= 26×
= 
= 
= 
=
= 
= 
= 6.4÷20%= 125%×8=
= 
÷
= 
= 55×
÷
=
×2= 1÷
= 
÷
= 0×
+
=
×15= 
×2= 
×
= 
×
=
÷
= 
÷3= 
÷5= 
÷
=
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