问题
解答题
计算:
|
答案
①356+83+144,
=(356+144)+83,
=500+83,
=583;
②53×99,
=53×(100-1),
=53×100-53,
=5300-53,
=5247;
③199×39+39,
=39×(199+1),
=39×200,
=7800;
④125×25×32,
=(125×8)×(4×25),
=1000×100,
=100000.
计算:
|
①356+83+144,
=(356+144)+83,
=500+83,
=583;
②53×99,
=53×(100-1),
=53×100-53,
=5300-53,
=5247;
③199×39+39,
=39×(199+1),
=39×200,
=7800;
④125×25×32,
=(125×8)×(4×25),
=1000×100,
=100000.