计算.(1+1.2+1.23
计算.(1+1.2+1.23+1.234)×(1.2+1.23+1.234+1.2345)-(1+1.2+1.23+1.234+1.2345)×(1.2+1.23+1.2...
计算.(1+1.2+1.23+1.234)×(1.2+1.23+1.234+1.2345)-(1+1.2+1.23+1.234+1.2345)×(1.2+1.23+1.234)
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设1+1.2+1.23+1.234=a,1+1.2+1.23+1.234+1.2345=b,则: (1+1.2+1.23+1.234)×(1.2+1.23+1.234+1.2345)-(1+1.2+1.23+1.234+1.2345)×(1.2+1.23+1.234), =a×(b-1)-b×(a-1), =ab-a-ab+b, =b-a, =(1+1.2+1.23+1.234+1.2345)-(1+1.2+1.23+1.234), =1.2345. |
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