77x78x79简便运算

77*78*79 =(78-1)*78*(78+1) =(78-1)(78+1)*78 =(78-1)*78 =78-78 =474552-78=474474 用平方差公式计算比较简便.

77乘78乘79=78(78-1)(78+1)=78*(78-1)=78-78=474474

77*78*79=7*11*6*13*79=(11*13*7)*(6*79)=(143*7)*474=1001*474=1000*474+1*474=474000+474=474474

79 =77又79分之1 你好78*78/79 =(79-1)*78/,本题已解答,如果满意 请点右上角“采纳答案”;79 =79*78/79-1*78/79 =78-78/

78*78/79=(79-1)(79-1)/79=79^2-2*79+1/79=79-2+1/79=77+1/79=77又1/79

78*78/79用简便方法=(79-1)x78/79=78-78/79=77又79分之1

77*78*79=78*(78-1)*(78+1)=78*(78^2-1)=78^3-78=474552-78=474474

79*78/79-78/79 =78-78/79 =77又1/79

79 +78+ 77x98=77+2+77+1+77*(100-2)=77*100+2+1=7700+3=7703

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