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（第丸届“希望杯”数学邀请赛初二试题）解法1赋值代入法．不妨取a＝l代入已知等式，得1十十二4．解法2转化代人法．解法3零值代人法．解法4归一代人法．由上十十二4，得a＋b二4ah．以上几种解法，开阔了我们的视野，培养了思维的灵活性．虽然题目不大，却耐人寻味．只要同学
(First pill “Hope Cup” mathematics Invitational second test) solution 1 assignment substitution method. May wish to take a = l into the known equation, get 1 twelve twelve 4. Solution 2 conversion generation method. Solution 3 zero value generation method. Solution 4 to a generation of law. From the last twelve twelve, a+b two 4ah. The above several solutions have broadened our horizons and cultivated the flexibility of thinking. Although the topic is not large, it is intriguing. As long as the students