用简便方法计算 8*[125*49+125*21]
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![用简便方法计算 8*[125*49+125*21]](/uploads/image/z/34679-47-9.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97+8%2A%5B125%2A49%2B125%2A21%5D)
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用简便方法计算 8*[125*49+125*21]
用简便方法计算 8*[125*49+125*21]
用简便方法计算 8*[125*49+125*21]
8*[125*49+125*21]
=8*125*49+8*125*21
=1000*49+1000*21
=1000*(49+21)
=1000*70
=70000