Giúp mình vs!! Mình cảm ơn ạ.
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2 tháng 1 2022
1, The homework is too difficult for him to do
2, The homework isn't easy enough for him to do
3, The homework is so difficult that he can't do it
4, It is such difficult homework that he can't do it
DT
7 tháng 1 2022
1. My sister says she went to school by bus this morning.
My sister said she had gone to school by bus that morning.
2. Nga says she have done her homework.
Nga said she had done her homework.
7 tháng 1 2022
1, My sister says that she goes to school by bus this morning
My sister said that she had gone to school by bus this morning
2, Nga says that she have done her homework
Nga said that she had done her homework
PL
1
21 tháng 9 2021
b: Ta có: \(5x\left(12x+7\right)-3x\left(20x-5\right)=-100\)
\(\Leftrightarrow60x^2+35x-60x^2+15x=-100\)
\(\Leftrightarrow50x=-100\)
hay x=-2
1: BC=căn 7,5^2+10^2=12,5cm
AH=7,5*10/12,5=6cm
góc ADH=góc AEH=góc DAE=90 độ
=>ADHE là hcn
=>DE=AH=6cm
2: ΔAHB vuông tại H có HD là đường cao
nên AD*AB=AH^2
ΔAHC vuông tại H có HElà đường cao
nên AE*AC=AH^2
=>AD*AB=AE*AC
3: ΔAHB vuông tại H có HD là đường cao
nên DH^2=AD*DB
4: AD=AH^2/AB=6^2/7,5=36/7,5=4,8cm
AE=AH^2/AC=6^2/10=3,6cm
S AED=1/2*3,6*4,8=8,64cm2