某学校的教学楼有四层，五年级一班的同学第一节课到三楼上数学课，第二节课到二楼上音乐课，第三节课到四楼上微机课，中午到一楼食堂吃饭．如图所示的哪一幅图准确描述了这一事件？
56+37=80﹣16=31.5+5=12﹣1.1= 2×0.2=2.87÷0.7=30÷50=25×8=========
口算，直接写出得数． 64﹣46= 1.72+2.38= 0.25×40= 2.4÷0.6=== 12= 8×12.5%== 0.52=
直接写出得数 25+75= 8﹣5.3= 4.65×100=×4÷×4=×2= 10÷= 350÷50=+﹣×=
2×0.3=÷12= 315﹣198=÷=
直接写得数． 76+23= 0.4×0.2= 0.32+3.2=+= 25÷0.5= 12÷=×= 43÷10%=
=
=
=
=
=
=
=
=
=
= 12
= 8×12.5%=
= 0.52=
×4÷
×2= 10÷
= 350÷50=
+
×
=
÷12=
÷
=
+
=
=
×
= 43÷10%=
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