3.42+5.58= 6.8﹣1.9= 10﹣8.4= 0.4×25=
8.4÷0.7= 
= 
= 
=
= 0÷
= 1.2×5= 3.9÷0.3=
247﹣99= 647﹣19﹣81= 4.3×5×0.2= 8.7﹣（3.9+1.7）=
3.42+5.58= 6.8﹣1.9= 10﹣8.4= 0.4×25=
8.4÷0.7= = = == 0÷= 1.2×5= 3.9÷0.3=
247﹣99= 647﹣19﹣81= 4.3×5×0.2= 8.7﹣（3.9+1.7）=
分米，它的周长是 分米，面积是 平方分米．
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