直接写出得数．20×4= 400×3= 5×0= 5+0= 0+0= +=1﹣= ﹣= 54÷9= 8×3+1= +=
直接写出得数． 1﹣=== 23= 52= x•x•x== a×8×b==== 4×3×25=
计算下面各题．+ 1﹣+．
直接写出得数.= 1﹣40%== 52= 1÷== 3﹣==== 0.8×÷=
看谁算得快．= 1﹣==== 1﹣=== 1﹣=== 1﹣=
怎样算简便就怎样算． ①= ②= ③= ④= ．
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﹣
= 54÷9= 8×3+1= 
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= 23= 52= x•x•x=
= a×8×b=
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= 4×3×25=
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= 1﹣40%=
= 52= 1÷
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= 0.8×
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= 1﹣
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= 1﹣
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= 1﹣
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