800²-1600×798+198² 99²+198+1分之100 简便方法计算啊①800²-1600×798+198² ② 99²+198+1分之100
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800²-1600×798+198² 99²+198+1分之100 简便方法计算啊①800²-1600×798+198² ② 99²+198+1分之100
800²-1600×798+198² 99²+198+1分之100 简便方法计算啊
①800²-1600×798+198² ② 99²+198+1分之100
800²-1600×798+198² 99²+198+1分之100 简便方法计算啊①800²-1600×798+198² ② 99²+198+1分之100
① 800²-1600×798+198²
=(800-798)^2+198^2-798^2
=4+(198-798)(198+798)
=4-600*(1000-4)
=4-600000+2400
=-597596
② 99²+198+1分之100
=(99+1)^2-1+1/100
=10000-1+1/100
=9999.01