计算下列各题：(1)125(40+8); (2)(100-4)(3)2004 (4)125792。

解答：

(1)125(40+8)

=12540+1258

=5000+1000

=6000;

(2)(1)125(40+8)

=12540+1258

=5000+1000

=6000;

(3)200425

=(2000+4)25

=200025+425

=50000+100

=50100;

(4)125792

=125(800-8)

=125800-1258

=(1258)100-1000

=1000100-1000

=1000(100-1)

=99000

计算下列各题：(1)125(40+8); (2)(100-4)(3)2004 (4)125792。

解答：

(1)125(40+8)

=12540+1258

=5000+1000

=6000;

(2)(1)125(40+8)

=12540+1258

=5000+1000

=6000;

(3)200425

=(2000+4)25

=200025+425

=50000+100

=50100;

(4)125792

=125(800-8)

=125800-1258

=(1258)100-1000

=1000100-1000

=1000(100-1)

=99000