98+49×48

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98+49×4898+49×4898+49×48=98+49×2×24=98+98×24=98×(1+24)=98×25=49×50=4900/2=245049*2+49*48提取就是98+49×48

98+49×48
98+49×48

98+49×48
=98+49×2×24
=98+98×24
=98×(1+24)
=98×25
=49×50
=4900/2
=2450

49*2+49*48 提取
就是
98+49×48
=98+(50-1)(50-2)
=98+2500-3*50+2
=100+2500-150
=2500-50
=2450

49*2+49*48 提取

98+49×48
=98+(50-1)(50-2)
=98+2500-3*50+2
=100+2500-150
=2500-50
=2450