Recent Content by Charon Ellis

Bài đã làm hết rồi mà ạ?

Program HINHTRON; Uses Crt; Var r,dt,cv:real; Begin Clrscr; Write ('Nhap ban kinh R='); readln(r); dt:=pi*r*r; cv:=2*pi*r; Writeln('Dien tich hinh tron la:',dt:6:2); Writeln('Chu vi hinh tron la:',cv:6:2); Readln; End.

4. be told 5. been discovered 6. sew (sew it back: may/ khâu lại) 7. been replaced 8. cost 9. whisper 10. be polluted III. 1. is said 2. are offered 3. was claimed 4. is considered 5. is shown 6. is expected 7. will be cemented 8. will be widened

Program shinhtron; uses crt; const pi=3.14; var r,s:real; BEGIN clrscr; write('Nhap ban kinh r: '); readln(r); s:=r*r*PI; writeln('dien tich hinh tron la: ',s:8:3,'m2'); readln END.

1. The students wrote their answers on the sheets. They submitted them to their teacher. => After the students had written answers on the sheets, they submitted them to their teacher. 2. Many people were walking in the park. Suddenly it rained. => While many people were walking in the park, it...

+) Quy ước gen: A quy định kiểu gen hạt dài t/c a quy định kiểu gen hạt tròn t/c +) Viết sơ đồ lai: Pt/c: AA (hạt dài) x aa (hạt tròn) Gp: A a F1: 100% Aa (hạt dài) F1 x F1: Aa (hạt dài) x Aa (hạt dài) GF1: A,a...

(1) why (2) more (3) all (4) there (5) though (6) vast (7) did (8) longer (9) this/it (10) as Đáp án than khảo từ: link

a/ na2co3 + hcl --> nacl + co2 +nacl baso4 + hcl (không phản ứng) b/ nCO2= 0,448/22,4 = 0,02(mol) nCO2 = nNa2CO3 = 0,02 mol => mNa2CO3 = 0,02 x 106=2,12(g) => %mNa2CO3 = 2,12/10 x 100 = 21,2% %mhh = %mNa2CO3 + %mBaSO4 => %mBaSO4 = %mhh - %mNa2CO3 = 100 - 21,2 = 78,8%

vì biểu thức dưới căn >=0 á