计算3÷〔9×（）〕×1293.6÷〔（6﹣2.88）×（﹣1.875）〕7.05×37+64×7.05﹣7.05 ÷〔7.8+×（2.75+1.25）〕8.1÷（）÷．
估算。83÷9≈ 79×30≈ 178÷6≈ 51×68≈
用竖式计算。（①②小题要验算）①51×26 = ②904÷3=③6.2＋3.9= ④ 836÷4=
口算20×8= 400×5= 36×2= 16×4= 38×0= 540÷9= 125-38= 930÷3= 1500÷3= 7×7-2= 5×9+7=
脱式计算。3.25÷2.5÷4 5 ×0.5÷5 ×0.5 86.27-(28.9+16.27) 1.6×[1÷(2.1-2.09)]
满分练习： 5÷8＝ 6÷9＝ 14×=22×= ×= ×=×= ×= ×=×= ×= ×3×= 4×= 0.5×=
）〕×12
﹣1.875）〕
÷〔7.8+
×（2.75+1.25）〕
）÷
．）〕×12﹣1.875）〕÷〔7.8+×（2.75+1.25）〕）÷．
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= 4×
= 0.5×
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