题目内容
直接写得数．
3.14×(32－22)＝ 10×2×3.14＝
答案：15.7;62.8
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直接写得数．
 + = | 3 -1.75= |  ÷ = |
 ×= |  × = |  ÷= |
 ÷ = |  ×0+3= | （+ ）×= |
直接写得数．
| -= | 3+1= |  ×6= | 7.43-1.4-2.6= | 1÷ = |
| 5.1+0.3= | 0÷（-）= | 25×4= | 5.4÷0.3= |
直接写得数．
 + = |  - = | 3+= | 1- = |  -（1-）= |
 - = | -= | + = |  += | 1-- = |