计算并验算.3354÷78=4.5×5.03=
直接写得数．= = = == = 0.375×= 4×÷4×=
直接写得数．5÷8= 25×2.4= 12﹣= 1.25××0.8=﹣= ×4÷4×= 2.4×= （+）×16=
甲数除以乙数的商与乙数除以甲数的商互为倒数（甲、乙均不为0）． ．
一个数除以真分数，商小于被除数． ．
饲养小组养白兔60只，灰兔45只．（1）白兔的只数是灰兔的几倍？灰兔的只数是白兔的几分之几？（2）白兔的只数比灰兔多几分之几？灰兔的只数比白兔少几分之几？
= 
= 
= 
=
= 
= 0.375×
= 4×
÷4×
=
= 1.25×
×0.8=
﹣
= 
×4÷4×
= （
+
）×16=
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