用简便方法计算.(1)7.6×27310+3.8×4525
来源:学生作业帮 编辑:灵鹊做题网作业帮 分类:数学作业 时间:2024/06/17 23:03:18
用简便方法计算.
(1)7.6×27
+3.8×45
(1)7.6×27
3 |
10 |
2 |
5 |
![用简便方法计算.(1)7.6×27310+3.8×4525](/uploads/image/z/3389663-47-3.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%8E%EF%BC%881%EF%BC%897.6%C3%9727310%2B3.8%C3%974525)
(1)7.6×27
3
10+3.8×45
2
5
=3.8×(2×27
3
10)+3.8×45
2
5,
=3.8×54
3
5+3.8×45
2
5,
=3.8×(54
3
5+45
2
5),
=3.8×100,
=380;
(2)1.1×4
21
97+40.9÷5
2
19−4.09×
9
97
=1.1×
409
97+40.9×
19
97-4.09×
9
97,
=4.09×
110
97+4.09×
190
97-4.09×
9
97,
=4.09×(
110
97+
190
97-
9
97),
=4.09×3,
=12.27.
3
10+3.8×45
2
5
=3.8×(2×27
3
10)+3.8×45
2
5,
=3.8×54
3
5+3.8×45
2
5,
=3.8×(54
3
5+45
2
5),
=3.8×100,
=380;
(2)1.1×4
21
97+40.9÷5
2
19−4.09×
9
97
=1.1×
409
97+40.9×
19
97-4.09×
9
97,
=4.09×
110
97+4.09×
190
97-4.09×
9
97,
=4.09×(
110
97+
190
97-
9
97),
=4.09×3,
=12.27.