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用简便方法计算.258+57+422865-86-414145+71+255+2925×85×4×28×19+72×1946×10224×125

题目详情
用简便方法计算.
258+57+42                     2865-86-414145+71+255+29                
25×85×4×28×19+72×19                   46×102
24×125                        2800÷25÷499×57+57                      
68×101-6865×99+65                      125×32
2700÷45÷2                    342+198-42+202
用简便方法计算.
258+57+42                     2865-86-414145+71+255+29                
25×85×4×28×19+72×19                   46×102
24×125                        2800÷25÷499×57+57                      
68×101-6865×99+65                      125×32
2700÷45÷2                    342+198-42+202

258+57+42                     2865-86-414145+71+255+29                
25×85×4×28×19+72×19                   46×102
24×125                        2800÷25÷499×57+57                      
68×101-6865×99+65                      125×32
2700÷45÷2                    342+198-42+202
258+57+42                     2865-86-414145+71+255+29                 25×85×4×28×19+72×19                   46×10224×125                        2800÷25÷499×57+57                      68×101-6865×99+65                      125×322700÷45÷2                    342+198-42+202258+57+42                     2865-86-414145+71+255+29                 258+57+42                     2865-86-414145+71+255+29                 25×85×4×28×19+72×19                   46×10225×85×4×28×19+72×19                   46×10224×125                        2800÷25÷499×57+57                      24×125                        2800÷25÷499×57+57                      68×101-6865×99+65                      125×3268×101-6865×99+65                      125×322700÷45÷2                    342+198-42+2022700÷45÷2                    342+198-42+202
▼优质解答
答案和解析
(1)258+57+42=258+42+57=300+57=357;(2)2865-86-414=2865-(86+414)=2865-500=2365;(3)145+71+255+29=145+255+71+29=(145+255)+(71+29)=400+100=500;(4)25×85×4×2=25×4×85×2=(25×4)×(85...