能简算的要简算.(1)4.25÷2.5×101-1.7 (2)12.8÷[0.5×(23.5-7.5)](3)1.25×7.6-0.25×7.6 (4)(8.25-3.75)÷2.5÷4.

问题描述:

能简算的要简算.
(1)4.25÷2.5×101-1.7                          
(2)12.8÷[0.5×(23.5-7.5)]
(3)1.25×7.6-0.25×7.6                         
(4)(8.25-3.75)÷2.5÷4.

(1)4.25÷2.5×101-1.7  
=1.7×101-1.7
=1.7×(101-1)
=1.7×100
=170
                  
(2)12.8÷[0.5×(23.5-7.5)]
=12.8÷[0.5×16]
=12.8÷8
=1.6
(3)1.25×7.6-0.25×7.6  
=(1.25-0.25)×7.6 
=1×7.6
=7.6
                      
(4)(8.25-3.75)÷2.5÷4
=4.5÷(2.5×4)
=4.5÷10
=0.45