77﹣53= 24+28= 400×8= 3200﹣700=
52+19= 97﹣43= 56÷7= 320+300=
34+56= 600×8= 34+8= 700+900=
45+37= 3000×4= 92﹣6= 47+35=
+
= 
﹣
= += 1﹣
=
77﹣53= 24+28= 400×8= 3200﹣700=
52+19= 97﹣43= 56÷7= 320+300=
34+56= 600×8= 34+8= 700+900=
45+37= 3000×4= 92﹣6= 47+35=+= ﹣= += 1﹣=
×21×
÷5×
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÷
÷24
×
÷8．
×9=
×0= 0÷
=
÷
=
×
=
÷
=
÷
=
×
=
÷5=
×12=
×
=
÷
÷
=
×
= 1÷
=
= 45×
=
÷2=
÷
=
×
=
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×0=
×
= 1﹣
=
÷
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×
= 15÷
=
×6=
+
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×
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×6=
÷
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= 1﹣
=
﹣
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×4=
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×
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÷4= 12÷
= 0.3×
=
×
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×
= 0×
+
=
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