脱式计算 16.3x7.2+8.7x7.2-25x4.2 8.88x9+28x1.11

=(16.3+8.7)x7.2-25x4.2 =25x7.2-25x4.2 =25x(7.2-4.2) =75 =1.11x(72+28) =111 请点一下右上角的采纳--来自百度知道专业认证教师