Cov tsiaj ntawv zoo li B thiab D muaj kab rov tav ntawm kev sib luag: lawv qhov saum thiab hauv qab sib phim. Qee cov tsiaj ntawv, piv txwv li, X, H, thiab O, muaj ob qho tib si ntsug thiab kab rov tav kab ntawm symmetry.
Puas yog tsab ntawv A puas muaj kab sib luag?
F thiab G muaj pes tsawg kab ntawm symmetry. Cov ntawv no tsis tuaj yeem muab ntim rau hauv ib nrab ntawm txhua txoj hauv kev nrog cov khoom sib txuam. Tag nrho cov ntawv, A, B, C, D, thiab E tag nrho tsuas muaj 1 kab ntawm symmetry. Daim ntawv ceeb toom tias A muaj kab ntsug ntawm qhov sib luag, thaum B, C, D, thiab E muaj kab rov tav ntawm qhov sib luag.
Puas muaj pes tsawg tus tsiaj ntawv hauv cov tsiaj ntawv muaj kab sib luag?
Vim li no, cov tsiaj ntawv uas muaj kab ntsug ntawm qhov sib luag yog A, H, I, M, O, T, U, V, W, X thiab Y. Nco ntsoov: Muaj 3 hom ntawm symmetry, uas yog, ntsug, kab rov tav, thiab kab pheeb ces kaum. Txhawm rau nrhiav cov kab ntawm symmetry, peb kos cov kab ntawm symmetry los xyuas seb qhov twg faib cov duab rau hauv ob qhov sib npaug.
Tus tsiaj ntawv twg tsis muaj kab sib luag?
Cov tsiaj ntawv Askiv tsis muaj kab sib luag yog F, G, J, L, N, P, Q, R, S thiab Z.
Txoj kab ntawm cov tsiaj ntawv F G J L N P Q R S thiab Z ntawm cov tsiaj ntawv Askiv yog dab tsi?
Dab tsi yog txoj kab sib luag rau cov tsiaj ntawv F, G, J, L, N, P, Q, R, S, thiab Z ntawm cov tsiaj ntawv Askiv? No line of symmetry.
