Question

457+302，103×24，36×41+36×59，25×48的简便计算快啊！

Answer 1

457+302
=457+300+2
=757+2
=759
103×24
=（100+3）×24
=100×24+3×24
=2400+72
=2472
36×41+36×59
=36×（41+59）
=36×100
=3600
25×48
=25×4×12
=100×12
=1200