摘要:5+0.6= 5-0.15= 4.35+5.36= 99×66+66=
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| 简便计算: 2.5×3.2×12.5 |
6.3÷1.4 | 2.5×2.4 |
| 15.32×4+4.68÷0.25 | 2.55×1.5+1.5+6.45×1.5 | 2.95×101-2.95 |
| 3.12+3.12×99 | 15÷(0.15×0.4) | 2.55×1.5+1.5+6.45×1.5 |
| 73.8-1.64-13.8-5.36 | 6.75-(0.9+3.75) | 27.38-5.34+2.62-4.66 |
| 35.72-4.9-(5.72+5.1) | 0.73-0.25-0.73+0.25 | 5.3+0.1+5.3-0.1 |
| 12.7-4.8-5.2. |
仔细观察,选择合适的方法计算.
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| (1)63+24+37 | (2)65+42+44 | (3)18+36+72 | (4)78+15+85 | (5)28+34+66 |
| (6)35+44+56 | (7)232-48-52 | (8)318-63-37 | (9)427-39-27 | (10)385-(78+85) |
| (11)63-9-9-9 | (12)500-97-98-99 | (13)700-101-102 | (14)351-(151+56) | (15)49+49+49+49 |
| (16)72+54+28+45 | (17)1+2+3+4+5+6+7 | (18)6+17+18+19 | (19)0+2+4+6+8+10+12 | (20)3+6+9+12+15+18+21. |
仔细观察,选择合适的方法计算.
| (1)63+24+37 | (2)65+42+44 | (3)18+36+72 | (4)78+15+85 | (5)28+34+66 |
| (6)35+44+56 | (7)232-48-52 | (8)318-63-37 | (9)427-39-27 | (10)385-(78+85) |
| (11)63-9-9-9 | (12)500-97-98-99 | (13)700-101-102 | (14)351-(151+56) | (15)49+49+49+49 |
| (16)72+54+28+45 | (17)1+2+3+4+5+6+7 | (18)6+17+18+19 | (19)0+2+4+6+8+10+12 | (20)3+6+9+12+15+18+21. |