总述：本次共解1题。其中
           ☆算术计算1题

〖1/1算式〗
    作业：求算式 2.1×(18.84+0.3×2+0.67×2.1)×(63.06+0.3×2+0.67×2.1)+2.1×(7.48+0.3×2+0.67×2.1)×3 的值.
    题型：数学计算
    解:
          2.1×(18.84+0.3×2+0.67×2.1)×(63.06+0.3×2+0.67×2.1)+2.1×(7.48+0.3×2+0.67×2.1)×3
        =2.1×20.847×(63.06+0.3×2+0.67×2.1)+2.1×(7.48+0.3×2+0.67×2.1)×3
        =2.1×20.847×65.067+2.1×(7.48+0.3×2+0.67×2.1)×3
        =2.1×20.847×65.067+2.1×9.487×3
        =43.7787×65.067+2.1×9.487×3
        =2848.548673+2.1×9.487×3
        =2848.548673+19.9227×3
        =2848.548673+59.7681
        =2908.316773
    答案:2.1×(18.84+0.3×2+0.67×2.1)×(63.06+0.3×2+0.67×2.1)+2.1×(7.48+0.3×2+0.67×2.1)×3=2908.316773

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