To solve arithmetic problems quickly. (to process) (urgent!) ① 4.31 * 1 / 2 + 5.69/2 ② 1 * 7.58 + 3.42 * 25% - 0.25 ③ 11 / 15 + (2 / 3-3 / 5) / 1 / 4 ④ 2 of 6.75 * 5 + 3.6 * 6 and 3 of 4 + 27 of 4 * 9 ⑤ 75 * 2.5 * 4 of 2 ⑥1.25*3.2*25 | Math enthusiast | Mathematical art

To solve arithmetic problems quickly. (to process) (urgent!) ① 4.31 * 1 / 2 + 5.69/2 ② 1 * 7.58 + 3.42 * 25% - 0.25 ③ 11 / 15 + (2 / 3-3 / 5) / 1 / 4 ④ 2 of 6.75 * 5 + 3.6 * 6 and 3 of 4 + 27 of 4 * 9 ⑤ 75 * 2.5 * 4 of 2 ⑥1.253.225

① 4.31 * 1 / 2 + 5.69/2 = (4.31 + 5.69) / 2 = 10 / 2 = 5
② 1 * 7.58 + 3.42 * 25% - 0.25 = [7.58 + 3.42-1] / 4 = 10 / 4 = 2.5
③ 11 / 15 + (2 / 3-3 / 5) / 1 / 4 = 11 / 15 + [(10-9) / 15] * 4 = [11 + 4] / 15 = 1
④ 6.75 * 2 / 5 + 3.6 * 6 and 3 / 4 + 27 * 9 = 1.35 * 2 + 27 / 4 * (3.6 + 9) = 2.7 + 3.15 * 27 = 27 * 3.25
⑤ 75 * 2.5 * 4 = 75 * 5 = 385
⑥1.25*3.2*25=32X25/(10X4)=5X8X4X10/[4X10]=20

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