直接写得数．1﹣0.92= 12.12﹣12= = == = 2.7+1.63+7.3= 0.83×9+0.83=1.25×= 78÷2.5÷4=
看谁算的又对又快．+=+=﹣= 2﹣=+=+=
直接写得数．+=﹣= 1﹣=﹣0.25= 6+=+=+=﹣= 1﹣﹣=++=．
口算：+=﹣=+3= 2.6﹣1= 5﹣=﹣=+=﹣= 2﹣﹣=+﹣= 1﹣（+）=+++=
能简算要简算．﹣+ 10﹣﹣+（﹣）
筑路队修一条公路，第一周修了千米，比第二周少修千米．两周一共修了多少千米？
= 
=
= 
= 2.7+1.63+7.3= 0.83×9+0.83=
= 78÷2.5÷4=
+
+
=
﹣
= 2﹣
=
+
=
+
=
+
=
﹣
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﹣0.25= 6+
+
=
+
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﹣
= 1﹣
﹣
=
+
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=．
+
=
﹣
+3= 2.6﹣1
=
=
﹣
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= 1
﹣（
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+
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﹣
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﹣
+（
﹣
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千米，比第二周少修
千米．两周一共修了多少千米？
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