题目内容
选择最好的方法计算
(1)6.37-1
+1.63-
(2)2.5×16
(3)已知A△B=(A+B)+A÷B求(2△1)△2.5.
(1)6.37-1
| 3 |
| 4 |
| 1 |
| 4 |
(2)2.5×16
(3)已知A△B=(A+B)+A÷B求(2△1)△2.5.
(1)6.37-1
+1.63-
,
=(6.37+1.63)-(1
+
),
=8-2,
=6;
(2)2.5×16,
=2.5×4×4,
=10×4,
=40;
(3)(2△1),
=(2+1)+2÷1,
=3+2,
=5;
5△2.5,
=(5+2.5)+(5÷2.5),
=7.5+2,
=9.5;
因此(2△1)△2.5=9.5.
| 3 |
| 4 |
| 1 |
| 4 |
=(6.37+1.63)-(1
| 3 |
| 4 |
| 1 |
| 4 |
=8-2,
=6;
(2)2.5×16,
=2.5×4×4,
=10×4,
=40;
(3)(2△1),
=(2+1)+2÷1,
=3+2,
=5;
5△2.5,
=(5+2.5)+(5÷2.5),
=7.5+2,
=9.5;
因此(2△1)△2.5=9.5.
练习册系列答案
相关题目