题目内容
计算(能简算的要简算)
(1)(
×
+
×
)×18.5;
(2)
×8+
+4×
;
(3)2.8×4.1+0.28×59;
(4)26.7-1.7×5-1.5.
(1)(
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
(2)
| 7 |
| 13 |
| 7 |
| 13 |
| 7 |
| 13 |
(3)2.8×4.1+0.28×59;
(4)26.7-1.7×5-1.5.
(1)(
×
+
×
)×18.5,
=
×(
+
)×18
,
=
×1×
,
=
,
=16
;
(2)
×8+
+4×
,
=
×(8+1+4),
=
×13,
=7;
(3)2.8×4.1+0.28×59,
=2.8×4.1+2.8×5.9,
=2.8×(4.1+5.9),
=2.8×10,
=28;
(4)26.7-1.7×5-1.5,
=26.7-8.5-1.5,
=26.7-(8.5+1.5),
=26.7-10,
=16.7.
| 8 |
| 9 |
| 8 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
=
| 8 |
| 9 |
| 8 |
| 9 |
| 1 |
| 9 |
| 1 |
| 2 |
=
| 8 |
| 9 |
| 37 |
| 2 |
=
| 148 |
| 9 |
=16
| 4 |
| 9 |
(2)
| 7 |
| 13 |
| 7 |
| 13 |
| 7 |
| 13 |
=
| 7 |
| 13 |
=
| 7 |
| 13 |
=7;
(3)2.8×4.1+0.28×59,
=2.8×4.1+2.8×5.9,
=2.8×(4.1+5.9),
=2.8×10,
=28;
(4)26.7-1.7×5-1.5,
=26.7-8.5-1.5,
=26.7-(8.5+1.5),
=26.7-10,
=16.7.
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