59又1/2×2/3+79又1/3×3/4+99又1/4×4/5+119又1/5×5/6=?求简算.85又1/3×3/8+71又1/6×6/7+56又1/4×4/54×5又3/4+5×6又4/5+6×7又5/6+7×8又6/7+8×9又7/81949×(1/51-1/2000)+51×(1/1949-1/2000)-2000×(1/1949+1/51)+3=1949/51-1949/2000+5
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 18:50:30
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