（918*17+8*18）*4
=（900x17+18*17+8*18）*4
=900x17x4+(17+8)x18x4
=900x68+25x4x18
=900x68+100x9x2
=900x(68+2)
=900x70
=63000
如果本题有什么不明白可以追问,
（918*17+8*18）*4
=（900x17+18*17+8*18）*4
=900x17x4+(17+8)x18x4
=900x68+25x4x18
=900x68+100x9x2
=900x(68+2)
=900x70
=63000
如果本题有什么不明白可以追问,