题目

怎样简便就怎样计算 ①（ + ）×5×6②98× ③（15﹣14× ）× ④12.5%×25+ ×15． 答案：解：①（ 35 + 16 ）×5×6 = 35 ×5×6+ 16 ×5×6=18+5=23②98× 9697 =（97+1）× 9697 = 97×9697+1×9697 = 96+9697 = 969697 ③（15﹣14× 47 ）× 821 =（15﹣8）× 821 = 7×821 = 83 ④12.5%×25+ 58 ×15= 18×25+18×5×15 = 18×(25+75) = 18×100 =12.5

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