怎样算简便就怎样算． 6.71×0.52+4.8×0.671 3.8+2.49+7.51+4.2 102×4.5 31.7﹣0.5×0.7﹣1.65．
口算． 0.48÷0.3= 18×1%= 2.5×40= 1﹣=÷=
1.25÷2.5= 36×（+）= 9÷9= 5×÷×5= 8﹣8÷9=÷7=
直接写出得数． 3.2÷0.01=×=÷= 5.6+3.99= 10×= 4××=÷= 6.4×0.5=
口算． 0.9×0.4= 31.4+6= 0.64÷4=﹣=÷=×=﹣=÷4=++= 1﹣﹣=
3.14×8= 0.8×40%= 0.125×32=﹣= 4.5×102= 0.52﹣0.32= 10×10%= 7×÷7×= 3.14×0.9+3.14×0.1= 52×20%= 30÷75%= 6÷（﹣）=
=
÷
=
+
）= 9
÷9=
÷
÷7=
×
=
÷
= 5.6+3.99=
= 4×
×
=
÷
= 6.4×0.5=
﹣
=
÷
=
×
=
﹣
=
÷4=
+
+
= 1
﹣
﹣
=
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=
÷7×
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