(1)64×〔1÷(﹣2.09)〕
(2)×〔﹣(+)〕
(3)++++
(4)
(5)20×20﹣19×19+18×18﹣17×17+…+2×2﹣1×1.
0.5×0.4= | 1.4+0.72= | 0.8+1.3-0.8+1.3= | 400÷25÷8= |
0.33= | ÷ = | × ÷ × = | 1- + = |
| 0.230.15 |
840÷4= | 120×30= | = |
4.6+4= 0.53=
1.25×0.7×8=
①
②
③
④
⑤
⑥
- = + - + =
43= 0.25÷2.5= 0.62=