一块蛋糕，平均分成8份，我吃了2块，妈妈吃了1块，我们俩一共吃了几分之几，还剩几分之几？
口算10﹣3.25= 1÷÷= ÷3= 1.8÷0.5=×1.8= ÷1= 1.2+= 0÷4=0.1﹣0.01= 5.8×9+5.8= 3×6= 21÷=
17.5吨比20吨少几分之几？
比18多60%的数是多少？
直接写出得数．÷= 0÷= ÷= 4×= ÷×0=÷1= ÷3= ÷= ÷= ×100÷100=
直接写出结果：÷2÷= 1.68+1.5= 7÷1.4= 9+=0.9+99×0.9= 0.77+0.33= 32÷53×0= ÷7=（0.18+0.9）÷9= 2.6﹣1.7=
÷
= 
÷3= 1.8÷0.5=
×1.8= 
÷1
= 1.2+
= 0÷4
×6= 21÷
=
÷
= 0÷
= 
÷
= 4×
= 
÷
×0=
÷1= 
÷3= 
÷
= 
÷
= 
×100÷100=
÷2÷
= 1.68+1.5= 7÷1.4= 9+
=
÷7=
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