摘要:1.口算.
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| 口算. 100-43= |
56÷14= | 18×5= | 630÷70= | 550÷5= |
| 69÷3= | 14×30= | 24+86= | 60×80= | 960÷80= |
| 180×30= | 720÷60= | 750÷50= | 17×50= | 450÷90= |
| 36×20= |
| 口算. 180-80= |
800+900= | 28-9= |
| 420-370= | 250-70= | 600-300= |
| 290+80= | 730+90= | 7×5+2= |
| 26+48= | 400+600= | 30-5×4= |