小胖语文、英语、自然三科测验的平均成绩是85分，数学要考到几分以上，这四科的平均分才能达到87分以上？
直接写出计算结果．= = 8×= 12== = 2﹣= 1=
直接写出得数．3×= ÷0.5=9÷= ÷﹣=（1﹣）÷= 2÷×=
直接写得数．×6= 30×= ÷= 20÷=+= ××0= ×= 1÷×=5.6÷0.08= 39××=
直接写得数．﹣= ÷= ×= ×= 10×= ×=÷= ÷= 15×= ÷= += ÷22=
直接写出得数．= = = = == = = = ．
= 
= 8×
= 12
=
= 
= 2﹣
= 1
=
= 
÷0.5=
= 
÷
﹣
）÷
×
=
×6= 30×
= 
÷
= 20÷
=
+
= 
×
×0= 
×
= 1÷
=
×
=
﹣
= 
÷
= 
×
= 
×
= 10×
= 
×
=
÷
= 
÷
= 15×
= 
÷
= 
+
= 
÷22=
= 
= 
= 
= 
=
= 
= 
= 
= 
．
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