直接写出得数．2.89﹣0.98﹦ 4.5×4×0.25﹦1﹣3÷8﹦ == =1.2万﹣0.8万= 0.42﹣0.22== =
12个连加的和是多少？
实际烧煤量比原计划节约． × （1） = ．
直接写结果×= 3×=×=×=×=×=×9=×0=
口算： 24×+×57+× 2﹣1+﹣ 1﹣﹣+﹣+×9+．
直接写得数===============
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= 
=
= 
=
连加的和是多少？
． × （1
） = ．
×
= 3×
=
×
=
×
×
=
×
=
×9=
×0=
+
×57
+
×
2﹣1
+
﹣
﹣
+
﹣
×9+
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
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