423. 常用対数表を用いて, 次のxの値を求めよ。 *1) log10x=0.6998 (2) log10x=-0.4908 解説を見る 423.(1) logiox=0.6998 となるxの値は, (2) -0.4908=-1+0.5092 x=5.01 =logio10-1+logio3.23=log.o(10-!×3.23) x=10-×3.23=0.323 より,求めるxの値は,

252 数 表 例2 S 常用対数表(一) 上位2桁の3.7を左の縦の欄から,末位の2を上欄からそれぞれ探してその交点を 見ると logio3.72=0.5705 が得られる。 この表では, 0.5705 の一の位の0は省略して表記している。 例1 logio3.72 の値を求めてみよう。 フ 8 9 4 5 6 数 1 2 3 .0374 .0755 .0294 .0682 .1038 .1367 .1673 .0334 .0719 .1072 .1399 .1703 .0212 .0253 .0170 .0569 .0086 .0492 -0828| .0864 .1206 .1523 .0128 .0531 -0899| .0934 .1239 .1553 .0043 .0453 1.0 1.1 1.2 1.3 1.4 .0000 .0645 .0607 .0414 .0792 .1139 .1461 .1106 .1430 .1732 -0969 |.1004 .1303 .1335 .1271 .1584 .1173 .1614 .1644 .1492 .2014 .1931 .2201 .2455 .2695 .2923 .1959 .2227 .1987 .2253 .2504 .1903 .1875 .2148 .1818 .2095 .2355 .2601 .1847 1.5 1.6 1.7 1.8 1.9 .1761 .2041 .2304 .1790 .2068 .2330 .2279 .2529 .2175 .2430 .2672 .2900 .2122 .2380 .2625 .2856 .2405 .2648 .2878 .2480 .2718 .2945 .2742 .2967 .2765 .2989 .2577 .2553 .2788 .2810 .2833 .3181 .3385 .3201 .3404 .3160 .3139 1.3345 .3118 .3096 .3304 .3502 .3692 .3874 .3054 .3263 2.0 2.1 2.2 2.3 2.4 .3075 .3284 .3483 .3674 .3856 .3032 .3010 .3222 .3424 .3617 .3365 .3324 .3522 .3243 .3444 .3636 .3820 .3598 .3560 .3747 .3927 .3579 .3766 .3945 .3541 .3464 .3655 .3838 .3729 .3909 .3784 | .3962 .3711 .3802 .3892 .4133 .4298 2.5 2.6 2.7 4048 |.4065 4082 .4249 .4099 .4116 .3979 .3997 .4014 .4031 .4281 .4183 .4346 .4502 .4654 .4200 .4362 .4518 .4150 .4166 .4216 .4232 .4265 .4393 .4548 4425 .4579 .4728 4456 .4609 .4757 .4440 .4330 .4487 .4639 .4378 .4533 .4409 .4314 .4472 2.8 2.9 .4564 .4594 -4624 .4669 .4683 .4698 .4713 .4742 3.0 3.1 3.2 3.3 3.4 .4786 .4928 .5065 .5198 .5328 .4814 .4955 .5092 .4829 .4969 .5105 .5237 .5366 -4771 .4914 .4800 .4843 .4857 .4997 .5132 .5263 .5391 .4871 .5011 .4886 .5024 .5159 .4900 .4942 .4983 .5038 .5051 .5185 .5315 .5079 .5211 .5340 .5119 .5250 .5378 .5145 .5276 .5403 .5172 .5224 .5289 .5302 .5353 .5416 .5428 3.5 3.6 3.7 3.8 3.9 .5441 .5465 .5587 -5694 .5705 .5717 .5453 .5575 .5478 .5599 .5490 .5611 .5729 .5502 .5623 .5514 .5635 .5752 .5866 .5527 .5539 .5658 .5551 .5563 .5647 .5670 -5682 .5798 .5911 .5740 .5855 .5966 .5763 .5877 .5775 .5888 .5786 .5899 .5809 .5821 .5933 .5832 .5944 .5843 .5922 .5955 .5977 .5988 .5999 .6010 4.0 4.1 4.2 4.3 4.4 .6021 .6128 .6232 .6031 .6138 .6042 .6149 .6253 .6355 .6454 .6053 .6064 .6170 .6075 .6180 .6085 .6191 .6294 .6395 .6493 .6096 .6201 .6304 .6107 .6117 .6160 .6263 .6365 .6212 .6314 .6415 .6513 .6222 .6325 .6425 .6243 .6345 .6274 .6284 .6375 .6385 .6474 .6335 .6405 .6435 .6444 .6464 .6484 .6503 .6522 .6532 | .6542 .6551 .6628 4.5 4.6 4.7 4.8 4.9 .6561 .6571 .6656 .6749 .6839 .6580 .6675 | .6684 .6767 .6857 .6590 .6599 .6693 .6785 .6875 .6609 .6702 .6794 .6884 .6972 .6618 .6712 .6803 .6893 .6981 .6637 .6646 .6739 .6830 .6920 .6665 .6758 .6848 .6937 .6721 .6730 .6812 | .6821 .6902 .6776 .6866 .6955 .6911 .6928 .6946 .6964 5.0 5.1 5.2 5.3 5.4 .6990 .7076 .7160 .6998 .7007 .7093 .7177 .7016 .7101 .7185 .7267 .7348 .7024 .7110 .7193 .7275 .7356 .7033 .7118 .7202 .7284 .7364 .7042 .7126 .7210 .7292 .7372 .7050 .7135 .7218 .7300 .7059 .7143 .7084 .7168 .7251 .7332 .7067 .7243 .7324 .7226 .7308 .7388 .7152 .7235 .7259 .7340 .7316 .7396 .7380 logio元=0.4971, logio2z=0.7982 0 p9 01234 5 6789 012 -- 22 222 22222 333っ 33 333 ーNの456 eトo9 Gb マママ の oー 234 55555