甲、乙、丙每分钟的速度分别为75米、80米、100米．甲、乙从A地，丙从B地，同时相向出发，丙遇上乙后3分钟再遇到甲．求A、B两地的距离．
直接写得数．×0= ×= ×12= ×=45×= ÷= ×= ÷=18×= ×= 1÷= ÷=
直接写出得数．×12= ÷= （ ）2= 4﹣4×= 1×= 43÷=÷= ×8+×8= 0.9×= 12×﹣= ×7÷×7= =
直接写出得数．÷= 0×= ÷= ÷1=÷= 1+= ×= ×=
直接写出得数．12×= += ÷8= ﹣=
直接等结果×1= ﹣= 0.25×0.4= ÷=5+5= 16×（﹣）= 4×25%= ÷4=
×0= 
×
= 
×12= 
×
=
= 
÷
= 
×
= 
÷
=
= 
×
= 1÷
= 
÷
=
×12= 
÷
= （ 
）2= 4﹣4×
= 1
×
= 43÷
=
÷
= 
×8+
×8= 0.9×
= 12×
﹣
×7÷
=
÷
= 
÷
= 
÷1=
÷
= 1+
= 
×
= 
×
=
= 
+
÷8= 
﹣
=
×1
= 
﹣
= 0.25×0.4= 
÷
=
= 16×（
﹣
）= 4×25%= 
÷4=
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