DAP AN CSCNCTM - DAI TRA - THINGAY 13/7/2020
Cau 1:
- Vi gia cong doan true 30 va 16 10 lien tuc (khong bi chi ti6t khac xen vao) va khong doi may
(ch6 lam viec) nen day la 1 nguyen cong. (Noi dugc 1 n/c va giai thich: 0.5d)
- Nguyen cong nay co 3 buoc: - Noi dugc 3 buoc: 0.5d
- Giai thich dugc 3 buoc: 0.5d
- Giai thich dugc 3 duomg chuyen dao: 0.5d
Buoc 1: Tien tho doan true 30 gom co 3 duomg chuyen dao vi 6 day gia cong 3 lan gidng
nhau
? r
Buoc 2: Tien tinh doan true 30 vi da thay doi chieu sau cat (thay doi che do cat) tir 3 mm cat
tho sang 1 mm cat tinh
Buoc 3: Khoan 16 10 vi da thay doi be mat gia cong tir doan true 30 sang 16 10.
Cau 2:
2.1. Co the dinh vi theo 1 trong 2 phuomg an sau (hoac phuone an hap ly khac) (cac hinh ve phai
co dirotig tam)
K6 ten dugc 5 bac tu do (phai co he toa do):
2.2. Ca 2 phuomg an dinh tren deu gay ra sai so chuan cho kich thuoc 40 vi chuan dinh vi la mat dau
ben trai cua true khong trung voi goc kich thuoc la mat dau ben phai
cua true. (Giai thich: 0.5d)
>
.lflfoul
KAAA
__
a
___
j4£L
X2
.....si
Lap chuoi (hinh ve): (0.5d)
Tinh: (0.5d)
a - X2 + 40 = 0
'jAdtWtj fuj> d i'n l i/y Iduhp
Ait chuan) epeu.
ro iAi kfUrucan ^
'k'nfu CZu £Zi V. r i r i .
Truong hgp
so chuan thi
Khi do, cau
«=> 40 = X2 - a
Ma a la hang so, nen kich thuoc 40 chi phu thuoc vao kich thuoc X2
S6 hieu: BM1/QT-PBBCL-RBTV 3
