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脱式计算. 8.82×15-100 15.8-718

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/09 17:54:49
脱式计算.
8.82×15-100 15.8-
7
18
(1)8.82×15-100
=132.3-100
=32.3;
(2)15.8-
7
18+14.2-
11
18
=(15.8+14.2)-(
7
18+
11
18)
=30-1
=29;
(3)21.6-0.8×4÷0.8×4
=21.6-3.2÷0.8×4
=21.6-4×4
=21.6-16
=5.6;
(4)3
3
5×3.7+3.6+5.3×3
3
5
=3
3
5×3.7+3
3
5×1+5.3×3
3
5
=3
3
5×(3.7+1+5.3)
=3
3
5×10
=36;
(5)2.5×4.4
=2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11;
(6)(1.5+2
2
3)÷3.75-
2
3
=
25
6÷3.75-
2
3
=
25

4
15-
2
3
=
10
9-
2
3
=
4
9.