4.计算。-|||-(1)直接写得数。-|||-6+4.1=-|||-times 30=-|||-8.1-1.5=-|||-div 30=-|||-div 50=-|||-div 6=-|||-1-0.4=-|||-times 8=-|||-2.6-0.4=-|||-div 600=-|||-times 79approx -|||-div 67approx -|||-div 90=-|||-2.4+0.6=-|||-times 40=-|||-div 35=-|||-*850div 56=-|||-(3)脱式计算。-|||-(20+120div 20)times 5-|||-div [ (160+200)div 60] -|||-+187div 17-34-|||-(47-22)times (710-670)-|||-times 25+899div 31times 397=-|||-(2)列竖式计算。(带"※"的要验算。)-|||-div 33=-|||-div 47=-|||-※ div 25=-|||-div 20=4.计算。-|||-(1)直接写得数。-|||-6+4.1=-|||-times 30=-|||-8.1-1.5=-|||-div 30=-|||-div 50=-|||-div 6=-|||-1-0.4=-|||-times 8=-|||-2.6-0.4=-|||-div 600=-|||-times 79approx -|||-div 67approx -|||-div 90=-|||-2.4+0.6=-|||-times 40=-|||-div 35=-|||-*850div 56=-|||-(3)脱式计算。-|||-(20+120div 20)times 5-|||-div [ (160+200)div 60] -|||-+187div 17-34-|||-(47-22)times (710-670)-|||-times 25+899div 31times 397=-|||-(2)列竖式计算。(带"※"的要验算。)-|||-div 33=-|||-div 47=-|||-※ div 25=-|||-div 20=

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