66×25 102×56 3248÷16 简便运算。急！！！！！！！

Question

66×25 102×56 3248÷16 简便运算。急！！！！！！急！！！！！！！
急！！！！！明天就要交作业了！！！！！！！

Answer 1

答：
66×25
=(60+6)×25
=60×25+6×25
=1500+150
=1650

102×56
=(100+2)×56
=100×56+2×56
=5600+112
=5712

3248÷16
=(3200+48)÷16
=3200÷16+48÷16
=200+3
=203

Answer 2

66x25=33x2x25=33x50=1650
102x56=(100+2)x56=100x56+2x56=5600+112=5712
3248÷16=(3200+48)÷16=3200÷16+48÷16=200+3=203

Answer 3

66×5×5 100×56+2×56 3248÷4÷4

Answer 4

答：
①66x25
=11x6x5x5
=11x(6x5)x5
=11x30x5
=11x(30x5)
=11x150
=(10+1)x150
=10x150+150
=1500+150
=1650

②102x56
=(100+2)x56
=100x56+2x56
=5600+112
=5712

③3248÷16
=(203x16)÷16
=203x16÷16
=203x(16÷16)
=203x1
=203