直接写出得数．1.8÷= 0.65+= 0.64+3.6= ×2÷= 349×≈+=1 ÷1.3= ÷2.4= 0.625×= 19.9×3.14≈
脱式计算，能简算的要简算． 60÷15+2.5×1.9×[÷（﹣）]++﹣ 0.65×8.7+6.5×0.23﹣0.65．
脱式计算，能简算的要简算 ①2.9×1.4+2×1.6 ②（2.44﹣1.8）÷0.4×20 ③4.6×9+4.6．
能简算的要简算． ①6.75×2.4+4.25×2.4﹣2.4 ②2004×．
96.5×43.5+43.5×28.5﹣25×43.5．
21.6﹣0.8×4÷0.8×4．
= 0.65+
= 0.64+3.6= 
×2÷
≈
+
=1 
÷1.3= 
÷2.4= 0.625×
= 19.9×3.14≈
×[
÷（
﹣
）]
+
+
﹣
．
．
粤公网安备 44130202000953号