（175+225）÷600．
直接写出得数．+=﹣= ÷= 1÷= ×=××=8×+8×= 55×÷= ×÷×= 0×+=
直接写得数5﹣= ×16= 1÷= ÷= ×=+= ﹣= 6﹣= ×6= （+）×8=
直接写得数+= ﹣= ×= ×5=2﹣= 3÷7= ÷= ÷4=
直接写出得数．+ ﹣ ×6 ×24 × 5÷4.8（+）×6 9×0+ （+）÷ 12×11×× 1.5﹣+﹣．
直接写出得数．1÷= 1﹣﹣= ×= =×12= （3+）×0= ÷= +=
+
=
﹣
= 
÷
= 1÷
= 
×
=
×
×
=
+8×
= 55×
÷
×
÷
= 0×
+
=
= 
×16= 1÷
= 
÷
= 
×
=
+
= 
﹣
= 6﹣
= 
×6= （
+
+
= 
﹣
= 
×
= 
×5=
= 3÷7= 
÷
= 
÷4=
+
﹣
×6 
×24 
×
5
÷4.8
+
）×6 9
×0+
（
+
12×11×
×
1.5﹣
﹣
．
= 1﹣
﹣
×
= 
=
×12= （3
+
）×0= 
÷
= 
+
=
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