123 + ( 122 x 12 ) -119
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DT
Đỗ Thanh Hải
CTVVIP
29 tháng 7 2021
1 are
2 Does - walk
3 is - are learning
4 are - doing
5 Does - walk
6 don't play
7 Is - working
8 is doing
9 are playing
10 is - living
11 teaches - is teaching
12 is studying
KY
29 tháng 7 2021
119.Phong, An , Ha, Lan (be)__________are______________.close friend.
120.______does_____your mother(walk)___walk______to market?
121.It (be)______is____10.00.We (learn)________are learning___________our lesson.
122.What____are_______you (do)______doing______now?
123._____Does_____your mother (walk) walk to work every day?
124.They (not play)________don't play________soccer in the morning.
125.___Is_________Hai(work)______working______in the garden at the moment?
126.My brother (do)___________is doing___________his homework in his room now .He do it every day.
127.James and his brother (play )_______are playing___________soccer at the moment.They (play) _____play____________it every afternoon.
128.Where______is__________the old man (live)____living_______now?
129.Mr.Smith often (teach)_________teaches______class 4A,but this morning he (teach) ________is teaching__________class 4B.
130.It’s 7.30 now. She (study)_________is studying______ science in the classroom.
CM
16 tháng 9 2019
Đáp án cần chọn là: D
M = 1 + 1 2 + 1 2 2 + 1 2 3 + ... + 1 2 99 + 2 2 100 2 M = 2. 1 + 1 2 + 1 2 2 + 1 2 3 + ... + 1 2 99 + 2 2 100 = 2 + 1 + 1 2 + 1 2 2 + 1 2 3 + ... + 1 2 99
Ta có :
M = 2 M − M = ( 2 + 1 + 1 2 + 1 2 2 + 1 2 3 + ... + 1 2 99 ) − ( 1 + 1 2 + 1 2 2 + 1 2 3 + ... + 1 2 99 + 2 2 100 ) M = 2 M − M = 2 + 1 + 1 2 + 1 2 2 + 1 2 3 + ... + 1 2 98 + 1 2 99 − 1 + 1 2 + 1 2 2 + 1 2 3 + ... + 1 2 99 + 1 2 100 = 2 − 1 2 100 = 2 101 − 1 2 100
PT
1
DT
0
4 tháng 3 2020
a,x-235=445
x= 445 + 235
x = 680
vậy x= 680
b, 546 - (x - 123) = 239
x-123= 546 - 239
x-123 = 307
x=307+ 123
x= 430
vậy x= 430
c, 5. (x-17)+ 12= 122
5.(x-17)= 122 -12
5.(x-17) = 110
x-17= 110: 5
x-17= 22
x= 22+ 17
x= 39
Vậy x= 39
4 tháng 3 2020
Bài 2.Tìm số tự nhiên x biết:
a,x-235=445
x=445+235
x=680
Vậy x=680
b,546-(x-123)=239
x-123=546-239
x-123=307
x=307+123
x=430
c,5.(x-17)+12=122
5(x-17)=122-12
5(x-17)=110
x-17=110:5
x-17=22
x=22+17
x=39
NN
3
D
2
16 tháng 2 2022
\(\dfrac{x+1}{124}+1+\dfrac{x+2}{123}+1=\dfrac{x+3}{122}+1+\dfrac{x+4}{121}+1\)
\(\Leftrightarrow\dfrac{x+125}{124}+\dfrac{x+125}{123}=\dfrac{x+125}{122}+\dfrac{x+125}{121}\)
\(\Leftrightarrow\left(x+125\right)\left(\dfrac{1}{124}+\dfrac{1}{123}-\dfrac{1}{122}-\dfrac{1}{121}\ne0\right)=0\Leftrightarrow x=-125\)
TD
16 tháng 2 2022
<=>\(\dfrac{x+1}{124}+\dfrac{x+2}{123}-\dfrac{x+3}{122}-\dfrac{x+4}{121}=0\)
<=>\(\left(\dfrac{x+1}{124}+1\right)+\left(\dfrac{x+2}{123}+1\right)-\left(\dfrac{x+3}{122}+1\right)-\left(\dfrac{x+4}{121}+1\right)=0\)
<=>\(\dfrac{x+125}{124}+\dfrac{x+125}{123}-\dfrac{x+125}{122}-\dfrac{x+125}{121}=0\)
<=>\(\left(x+125\right)\left(\dfrac{1}{124}+\dfrac{1}{123}-\dfrac{1}{122}-\dfrac{1}{121}\right)=0\)
<=>x+125=0
<=>x=-125
\(123+\left(122x12\right)-119\)
\(=123+1464-119\)
\(=1587-119\)
\(=1468\)
123+1464-119=1468