用递等式计算,能简便的要求写出简算过程.①36×14-15×25%-0.25②15.8-718+14.2-1118③(1+13)÷(1-1

2025-05-16 18:31:35
推荐回答(1个)
回答1:

①36×

1
4
-15×25%-0.25,
=36×0.25-15×0.25-0.25,
=(36-15-1)×0.25,
=20×0.25,
=5;

②15.8-
7
18
+14.2-
11
18

=(15.8+14.2)-(
7
18
+
11
18
),
=30-1,
=29;

③(1+
1
3
)÷(1-
1
3
),
=
4
3
÷
2
3

=
4
3
×
3
2

=2;

④2.5×3.2×12.5,
=2.5×4×0.8×12.5,
=(2.5×4)×(0.8×12.5),
=10×10,
=100.