a+b=d*12+56+12-16+7895623-78+11*0=0 đúng không hả Khôi?
Nhớ nhá!
a)(10^2+11^2+12^2):(13^2+14^2) b)1.2.3...9-1.2.3...8-1.2.3...7.8^2 c)(3.4.2)^16/11.2^13.4^11-16^9 d)1152-(374+1152)+(-56+374) e)13-12+11+10-9+8-7-6+5-4+3+2-1 |
1. Tính :
a. 12 x 13 + 12 x 49 + 12 x 14 + 14 x 78
b. 34 x 34 + 56 x 45 .
2. Hãy kết bạn với mình -- mình là ARMY nhá
a.1872
b.3676
2 tui cũng là army yiu bts nhìu
----jung hosoek---
a) 12 x 13 + 12 x 49 + 12 x 14 +14 x 78 = 1873
b) 34 x 34 + 56 x 45 = 3676
\(1.\text{ Tính : }\)
\(a,\text{ }12\text{ x }13+12\text{ x }49+12\text{ x }14+14\text{ x }78\)
\(=12\text{ x }\left(13+49\right)+14\text{ x }\left(12+78\right)\)
\(=12\text{ x }62+14\text{ x }90\)
\(=744+1260\)
\(=2004\)
\(b,\text{ }34\text{ x }34+56\text{ x }45\)
\(=1156+2520\)
\(=3676\)
Không làm phép tính, hãy cho biết kết quả của mỗi phép tính sau có tận cùng mặt chữ số nào ? a. ( 1991 + 1992 + ... + 1999 ) – ( 11 + 12 + ... + 19 )
A. 5 B. 0 C. 2
b. 21 x 23 x 25 x 27 – 11 x 13 x 15 x 17
A. 5 B. 25 C. 0
c. 16358 – 6 x 16 x 46 x 56 7
A. 0 B. 2 C. 4
Chọn câu đúng
A. (-50).(-12) = 600 B. 11.(-11) = -1111
C. (-20).(-5) = -100 D. (-18).25 = -400
Kết quả thực hiện các phép tính (-78) + 67 + 78 + 33
A. 100 B. -166 C. -56 D. -158
Chỉ duy nhất 1 kết quả cho 5 phép tính trong 1 phần- a) = ? 56/56 22/22 144/144 2861/2861 515195/515195 b) =? 12/-12 -34/34 -156/156 9873/-9873 -20020/20020 c) = ? 0/12 0/144 0/6026 0/92517 0/1534785 d) = ? 41552157/0 51131578631/0 146758963213314/0 25511243678637973632/0 124325764677421563257886532/0
1+2+3+4+5+6+7+7+8+9+10+11+12+13+14+45+15+16+17+18+19+20+21-56+56+48+52+78+84+54+2545+455+1454+1256-23+56+586=
1+2+3+4+....-56+56+48.......-23+56+586=6928
50+50+50=?
569+89+90=?
12+12=?
78+78=?
4+7=?
6+8=?
9+0=?
56-43=?
50+50+50
=150
569+89+90
= Bao nhiêu í mik chưa tính
12 + 12
=24
78+78
= 156
4+7
=11
6+8
=14
9+0
=9
56-43
= 13
=150
=748
=24
=156
=11
=14
=9
=13
nho k cho minh nha
a)11+11+11+11+11+11+11+11+11=
b)56+56+12+12+12+20+56+56+56=
c)\(45^8\)=
d)\(12^4\)
a)11+11+11+11+11+11+11+11+11=\(11^9\)=99.
b)56+56+12+12+12+20+56+56+56=56+56+56+56+56+56=\(56^6\)=336.
c)\(45^8\)=360.
d)\(12^4\)=48
a)11+11+11+11+11+11+11+11+11=\(11^9\)=99.
b)56+56+12+12+12+20+56+56+56=56+56+56+56+56+56=\(56^6\)=336.
c)\(45^8\)=360.
d)\(12^4\)=48
a)11+11+11+11+11+11+11+11+11=\(11^9\)=99.
b)56+56+12+12+12+20+56+56+56=56+56+56+56+56+56=\(56^6\)=336.
c)\(45^8\)=360.
d)\(12^4\)=48
Tìm nghiệm của bất phương trình sau :
a) \(\dfrac{x-12}{77}+\dfrac{x-11}{78}>\dfrac{x-74}{15}+\dfrac{x-73}{16}\)
b) ( x - 5) ( 2x+4) > 0
c) (x+3)(3x-6) < 0
easy làm câu b vs c trước nha
b) \(\left(x-5\right)\left(2x+4\right)>0\)
\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x-5>0\\2x+4>0\end{matrix}\right.\\\left\{{}\begin{matrix}x-5< 0\\2x+4< 0\end{matrix}\right.\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x>5\\x>-2\end{matrix}\right.\\\left\{{}\begin{matrix}x< 5\\x< -2\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x>5\\x< -2\end{matrix}\right.\)
Vậy......
c) \(\left(x+3\right)\left(3x-6\right)< 0\)
\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x+3>0\\3x-6< 0\end{matrix}\right.\\\left\{{}\begin{matrix}x+3< 0\\3x-6>0\end{matrix}\right.\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x>-3\\x< 2\end{matrix}\right.\\\left\{{}\begin{matrix}x< -3\\x>2\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}-3< x< 2\\x\in\varnothing\end{matrix}\right.\)
Vậy.......
Nốt câu a luôn nèk
\(\dfrac{x-12}{77}+\dfrac{x-11}{78}>\dfrac{x-74}{15}+\dfrac{x-73}{16}\)
\(\Leftrightarrow\left(\dfrac{x-12}{77}-1\right)+\left(\dfrac{x-11}{78}-1\right)>\left(\dfrac{x-74}{15}-1\right)+\left(\dfrac{x-73}{16}-1\right)\)\(\Leftrightarrow\dfrac{x-12-77}{77}+\dfrac{x-11-78}{78}>\dfrac{x-74-15}{15}+\dfrac{x-73-16}{16}\)\(\Leftrightarrow\dfrac{x-89}{77}+\dfrac{x-89}{78}>\dfrac{x-89}{15}+\dfrac{x-89}{16}\)\(\Leftrightarrow\dfrac{x-89}{77}+\dfrac{x-89}{78}-\dfrac{x-89}{15}-\dfrac{x-89}{16}>0\)\(\Leftrightarrow\left(x-89\right)\left(\dfrac{1}{77}+\dfrac{1}{78}-\dfrac{1}{15}-\dfrac{1}{16}\right)>0\)\(\Leftrightarrow x-89>0\)
\(\Leftrightarrow x>89\)
Hừm cx chưa chắc lắm