20世纪有这样一年，把这年的年号写在纸上，再把这张纸倒过来，仍然是这年，你知道这是哪一年吗？
直接写得数．+= ÷6= ×= 2﹣+=×16= 6﹣= ÷= 5×÷5×=
直接写得数．= == == 75%÷25%== =
= = = == = = == = = =
直接写出得数．+0.2= +﹣0.2= 5÷= ×1.5+3=3.6×= ×1.5= ﹣= 1﹣137.5%=
直接写得数﹣= ÷9= 1﹣= ×=÷= ÷= += ×=+= ÷= ﹣= ×=
+
= 
÷6= 
×
= 2﹣
+
=
×16= 6﹣
= 
÷
= 5×
÷5×
= 
=
= 
=
= 75%÷25%=
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=
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= 
=
= 
= 
= 
=
= 
= 
= 
=
+0.2= 
+
﹣0.2= 5÷
= 
×1.5+3=
= 
×1.5= 
﹣
= 1﹣137.5%=
﹣
= 
÷9= 1﹣
= 
×
=
÷
= 
÷
= 
+
= 
=
+
= 
÷
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﹣
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×
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