直接写出得数（约等号的填估算值）．
2.8+0.12= 2.5×0.4= 9÷1.5= 4000÷125÷8= 
﹣
=
10﹣
= 
÷
= 
×4÷
×4= 9.19×9.8≈ 27.475÷3.14≈
÷2×0= 
×4+×2=
直接写出得数（约等号的填估算值）．
2.8+0.12= 2.5×0.4= 9÷1.5= 4000÷125÷8= ﹣=
10﹣= ÷= ×4÷×4= 9.19×9.8≈ 27.475÷3.14≈÷2×0= ×4+×2=
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