57x43+42x43+43
=（57+42+1）×43
=100×43
=4300
99x11+33x67
=33×33+33×67
=33×（33+67）
=33×100
=3300
简算 .57x43+42x43+43 99x11+33x67
57x43+42x43+43
=（57+42+1）×43
=100×43
=4300
99x11+33x67
=33×33+33×67
=33×（33+67）
=33×100
=3300