1.41.2×8.1+11×9.25+537×0.19 2.55555×666667+44445×666666-155555 3.0.4 × [11 / 52 △ 2 and 3 / 4 × (4.3-1.8)] × 26 4.（2×4×8×16×32）×（25×6.25×1.25×0.25） 5.85.42×7903.29-286.5×790.329+79032.9×4.323 6.1.135+2.246+3.346+4.475+5.557+6.768+7.768+8.979+9.979 7.1/18+1/54+1/108+1/270+1/378+1/504+1/648+1/810+1/990 8.（1+1）/2+（2-1）/2²+（3-1）/2³+… +The 100th power of (100-1) / 2 9.（1-1/2-1/3-… -1/1999）×（1/2+1/3+1/4+… +1/2000）-[（1-1/2-1/3-… -1/2000）（1/2+1/3+… +1/1999）] 10.20-{[（2²+1）/（2²-1）]+[（3²+1）/（3²-1）]+[（4²+1）/（4²-1）]+… +[（20²+1）/（20²-1）]}

1.41.2×8.1+11×9.25+537×0.19 2.55555×666667+44445×666666-155555 3.0.4 × [11 / 52 △ 2 and 3 / 4 × (4.3-1.8)] × 26 4.（2×4×8×16×32）×（25×6.25×1.25×0.25） 5.85.42×7903.29-286.5×790.329+79032.9×4.323 6.1.135+2.246+3.346+4.475+5.557+6.768+7.768+8.979+9.979 7.1/18+1/54+1/108+1/270+1/378+1/504+1/648+1/810+1/990 8.（1+1）/2+（2-1）/2²+（3-1）/2³+… +The 100th power of (100-1) / 2 9.（1-1/2-1/3-… -1/1999）×（1/2+1/3+1/4+… +1/2000）-[（1-1/2-1/3-… -1/2000）（1/2+1/3+… +1/1999）] 10.20-{[（2²+1）/（2²-1）]+[（3²+1）/（3²-1）]+[（4²+1）/（4²-1）]+… +[（20²+1）/（20²-1）]}

1: The original formula is 41.2 * (10-1.9) + 11 * 9.25 + 53.7 * 1.9 = 412 + 11 * (10-0.75) + 12.5 * 1.9 = 412 + 110-1.1 * 7.5 + (20-7.5) * 1.9 = 412 + 110 + 20 * 1.9 - (1.1 * 7.5 + 1.9 * 7.5) = 412 + 110 + 38-3 * 7.5 = 560-22.5 = 537.5 2:55555 * 666667 + 4444445 * 6666-1555