简便方法计算如下:25×(66×20+46×80×4)=25x66x5x4+25x4x46x80=66x500+46x8000=33000+368000=698000
25×(66×20+46×80×4)=25x66x5x4+25x4x46x80=66x500+46x8000=33000+368000=698000