题目内容
计算下面各题.(能简算的要简算)
(1)6.75-2.75÷[10×(9.75-4
)]
(2)(1+
)+(1+
×2)+(1+
×3)+…+(1+
×20).
(1)6.75-2.75÷[10×(9.75-4
| 1 |
| 4 |
(2)(1+
| 19 |
| 105 |
| 19 |
| 105 |
| 19 |
| 105 |
| 19 |
| 105 |
(1)6.75-2.75÷[10×(9.75-4
)],
=6.75-2.75÷[10×(9.75-4.25)],
=6.75-2.75÷[10×5.5],
=6.75-2.75÷55,
=6.75-0.05,
=6.7;
(2)(1+
)×20,
=1×20+
×20,
=20+3
,
=23
.
| 1 |
| 4 |
=6.75-2.75÷[10×(9.75-4.25)],
=6.75-2.75÷[10×5.5],
=6.75-2.75÷55,
=6.75-0.05,
=6.7;
(2)(1+
| 19 |
| 105 |
=1×20+
| 19 |
| 105 |
=20+3
| 13 |
| 21 |
=23
| 13 |
| 21 |
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