直接写出得数. 529+198= 92= 305﹣199= 2.05×4= 8×12.5%= 0.28÷4= +×0= = 0.68++0.32= ÷+0.75×8=
估算:601530-205120≈687240-595905≈512500-145280≈586520-475450≈735433-205540≈595450-471246≈
估算:865500-578900≈803433-205000≈455464-205000≈866546-578900≈70123-105000≈553543-305540≈
口算:831500-554900=25650+21560=95410+21260=1249000-249000=2580010-2580000=246000+154000=
口算:865500-578900=95400+21560=258000-158000=125000+125000=3571000-2571000=2514980-2414980=
估算:205833-125000≈305533-125000≈3035433-205000≈862500-578900≈95453+21554≈3033533-204580≈