Cov txheej txheem:
Video: Yuav ua li cas koj txiav txim siab tus lej ntawm cov lej tseem ceeb hauv kev ntsuas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Muaj peb txoj cai los txiav txim seb muaj pes tsawg tus lej tseem ceeb hauv tus lej:
- Tsis yog xoom tus lej yog ib txwm tseem ceeb .
- Ib qho xoom ntawm ob tus lej tseem ceeb yog tseem ceeb .
- Qhov kawg xoom los yog trailing zeros nyob rau hauv cov zauv feem tsuas yog tseem ceeb .
Xav txog qhov no, pes tsawg lub figs no muaj pes tsawg tus?
Xav tias peb muaj tus tus lej 0.004562 thiab xav 2 cov duab tseem ceeb . Cov trailing zeros yog placeholder, yog li peb tsis suav lawv. Tom ntej no peb ncig 4562 rau 2 tus lej, tawm hauv peb nrog 0.0046.
Ib yam li ntawd, muaj pes tsawg tus lej tseem ceeb muaj 100? Kev Sau Ntawv
| (1) | 1000 | 1 x103 --so ib sig fig |
|---|---|---|
| (2) | 0.001 | 1 x10-3 --so ib sig fig |
| (3) | 100. | 1.00 x 102 -- yog li peb sig figs |
| (4) | 0.00100 | 1.00 x 10-3 -- yog li peb sig figs |
| (5) | 100 (nrog ob daim duab) | 1.0 x 102 -- yog li ob sig figs |
Ua li no, pes tsawg tus lej tseem ceeb hauv txhua qhov kev ntsuas?
Muab tus naj npawb ntawm cov duab tseem ceeb hauv txhua qhov ntsuas . Raws li txoj cai 1, tag nrho cov tsis yog zero tus lej yog tseem ceeb , yog li no ntsuas muaj peb cov duab tseem ceeb . Raws li txoj cai 4, thawj peb xoom tsis yog tseem ceeb , tab sis los ntawm txoj cai 2 lub xoom ntawm lub sixes yog; yog li ntawd, tus lej no muaj plaub cov duab tseem ceeb.
Muaj pes tsawg tus lej tseem ceeb hauv qhov ntsuas 603.040 g?
= 5 in all. = 5 cov duab tseem ceeb.
Pom zoo:
Yuav ua li cas koj txiav txim siab npaum li cas ntawm cov kua qaub uas yuav tsum tau neutralize lub hauv paus?
Kev daws qhov teeb meem Acid-Base Neutralization Kauj Ruam 1: Muab xam cov moles ntawm OH-. Molarity = moles / ntim. moles = Molarity x Volume. moles OH- = 0.02 M/100 milliliters. Kauj ruam 2: Xam qhov ntim ntawm HCl xav tau. Molarity = moles / ntim. Volume = moles/molarity. Volume = moles H+/0.075 Molarity
Yuav ua li cas koj thiaj nrhiav tau cov lej ntawm cov lej lej lossis cov lej geometric?
Cov mis rau qhov suav ntawm n cov ntsiab lus ntawm geometric ib ntus yog muab los ntawm Sn = a[(r^n - 1)/(r - 1)], qhov twg a yog thawj lub sij hawm, n yog lub sij hawm tus lej thiab r yog tus qhov piv txwv
Vim li cas kev ntsuas thiab ntsuas qhov tseem ceeb hauv kev tshawb fawb txog kev lag luam?
Cov nplai tau siv ntau zaus hauv kev tshawb fawb kev lag luam vim tias lawv pab hloov cov ntaub ntawv zoo (xav, kev xav, kev xav) rau hauv cov ntaub ntawv ntau, cov lej uas tuaj yeem txheeb xyuas tau. Koj tsim ib qho kev ntsuas los ntawm kev muab cov khoom (yuav ua tau piav qhia) rau tus lej
Vim li cas nws tseem ceeb heev uas yuav tsum xav txog ntau yam thaum txiav txim siab cov hauv paus hniav ntawm cov kab zauv polynomial?
Piv txwv li, tus naj npawb ntawm lub sij hawm ib tug muab polynomial sib npaug muaj ib lub hauv paus ntawm ib tug muab point yog lub multiplicity ntawm lub hauv paus. Qhov kev xav ntawm ntau qhov tseem ceeb yog qhov tseem ceeb kom suav tau kom raug yam tsis muaj kev qhia tshwj xeeb (piv txwv li, ob lub hauv paus suav ob zaug). Li no cov lus qhia, ' suav nrog ntau ntau'
Yuav ua li cas koj txiav txim siab uas yog tus nqi txiav txim kauj ruam?
Tus nqi txiav txim siab kauj ruam yog kauj ruam qeeb tshaj plaws ntawm cov tshuaj tiv thaiv tshuaj uas txiav txim siab qhov nrawm (tus nqi) uas tag nrho cov tshuaj tiv thaiv ua tiav. Teb Tus nqi txiav txim kauj ruam yog kauj ruam thib ob vim nws yog kauj ruam qeeb. 2NO + 2H2 → N2 + 2H2O. Cov intermediates hauv cov tshuaj tiv thaiv no yog N2O2 thiab N2O