题目内容
选用合适的方法计算:
| 7.5-(5.5+1.24) | 0.26+15.68+9.74+2.32 | 13.26+9.55-3.26 | 6.1+3.9-6.1+3.9. |
(1)7.5-(5.5+1.24),
=7.5-5.5-1.24,
=2-1.24,
=0.76;
(2)0.26+15.68+9.74+2.32,
=(0.26+9.74)+(15.68+2.32),
=10+18,
=28;
(3)13.26+9.55-3.26,
=13.26-3.26+9.55,
=10+9.55,
=19.55;
(4)6.1+3.9-6.1+3.9,
=6.1-6.1+(3.9+3.9),
=0+7.8,
=7.8.
=7.5-5.5-1.24,
=2-1.24,
=0.76;
(2)0.26+15.68+9.74+2.32,
=(0.26+9.74)+(15.68+2.32),
=10+18,
=28;
(3)13.26+9.55-3.26,
=13.26-3.26+9.55,
=10+9.55,
=19.55;
(4)6.1+3.9-6.1+3.9,
=6.1-6.1+(3.9+3.9),
=0+7.8,
=7.8.
练习册系列答案
相关题目