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用递等式计算.260+2639÷13-3150.5×[515÷(78-116)]8.56+(100-90.25)÷5(1+7.5%)×(1-25)

题目详情
用递等式计算.
260+2639÷13-315               0.5×[5
1
5
÷(
7
8
-
1
16
)]
8.56+(100-90.25)÷5          (1+7.5%)×(1-
2
5

1
5
÷(
7
8
-
1
16
)]
8.56+(100-90.25)÷5          (1+7.5%)×(1-
2
5
1
5
151155
7
8
-
1
16
)]
8.56+(100-90.25)÷5          (1+7.5%)×(1-
2
5
7
8
787788
1
16
)]
8.56+(100-90.25)÷5          (1+7.5%)×(1-
2
5
1
16
116111616
2
5
2
5
252255
▼优质解答
答案和解析
(1)260+2639÷13-315  =260+203-315   =148(2)0.5×[515÷(78-116)]=0.5×[265÷1316]=0.5×[265×1613]=0.5×325=3.2(3)8.56+(100-90.25)÷5=8.56+9.75÷5=8.56+1.95=10.51(4)(1+7.5%)×(1-25...