12 12 12 12 + 55 55 55 55 =
mot dau cach bang mot dau +
tinh gia tri cua bieu thuc:
A = \(\frac{55}{11.16}+\frac{55}{16.21}+\frac{55}{21.26}+\frac{55}{26.31}+\frac{55}{31.36}+\frac{55}{36.41}\)
* dau cham la dau nhan nhe
\(A=11x\left(\frac{5}{11x16}+\frac{5}{16x21}+\frac{5}{21x26}+\frac{5}{26x31}+\frac{5}{31x36}+\frac{5}{36x41}\right)\)
\(A=11x\left(\frac{16-11}{11x16}+\frac{21-16}{16x21}+\frac{26-21}{21x26}+...+\frac{41-36}{36x41}\right)\)
\(A=11x\left(\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+\frac{1}{21}-\frac{1}{26}+...+\frac{1}{36}-\frac{1}{41}\right)\)
\(A=11x\left(\frac{1}{11}-\frac{1}{41}\right)=11x\frac{30}{11x41}=\frac{30}{41}\)
A=\(\frac{55}{11.16}+\frac{55}{16.21}+...+\frac{55}{36.41}\)
A=\(11\left(\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+...+\frac{1}{36}-\frac{1}{41}\right)\)
A=\(11\left(\frac{1}{11}-\frac{1}{41}\right)\)
A=\(11.\frac{30}{451}\)
A=\(\frac{30}{41}\)
\(A=\frac{55}{11.16}+\frac{55}{16.21}+\frac{55}{21.26}+\frac{55}{26.31}+\frac{55}{31.36}+\frac{55}{36.41}\)
\(A=11\left(\frac{5}{11.16}+\frac{5}{16.21}+\frac{5}{21.26}+\frac{5}{26.31}+\frac{5}{31.36}+\frac{5}{36.41}\right)\)
\(A=11\left(\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+\frac{1}{21}-\frac{1}{26}+\frac{1}{26}-\frac{1}{31}+\frac{1}{31}-\frac{1}{36}+\frac{1}{36}-\frac{1}{41}\right)\)\(A=11\left(\frac{1}{11}-\frac{1}{41}\right)\)
\(A=11.\frac{30}{451}=\frac{30}{41}\)
(-55-12+83)-(-55+12+83)
1-3+5+7+...+21-23
mn lm hộ mk đyy r mk cho kẹo
Chung minh rang
A) 2^10+2^11+2^12 chia cho 7la mot so tu nhien
B) 8^10-8^9-8^8 chia cho 55 la mot so tu nhien
a. 2^10+2^11+2^12 chia cho 7 là một số tự nhiên
2^10+2^11+2^12
= 2^10 + 2^10 x2 + 2^10 x 2^2
=2^10 x ( 1+2+2^2)
=1024 x 7
= 7168
Vậy 2^10+2^11+2^12 chia cho 7 bằng 1024 và 1024 là một số tự nhiên
a) 5/9 * 12/25
b) 12/11 : 36/55
c) 9/55 * 22
d) 144/7 : 36
a) 5/9 x 12/25 = 4/15
b) 12/11 : 36/55 = 5/3
c) 9/55 x 22 = 18/5
d) 144/7 : 36 = 4/7
a) 5/9 x 12/25 = 4/15
b) 12/11 : 36/55 = 5/3
c) 9/55 x 22 = 18/5
d) 144/7 : 36 = 4/7
a) 5/9 x 12/25 = 4/15
b) 12/11 : 36/55 = 5/3
c) 9/55 x 22 = 18/5
d) 144/7 : 36 = 4/7
12*45+12*55=......?
=12 * ( 45 + 55 )
= 12 * 100
= 1200
Đúng 100%
Rút gọn:10*11+50*55+70*77/11*12+55*60+77*84
\(=\dfrac{10\cdot11+25\cdot10\cdot11+49\cdot10\cdot11}{11\cdot12+25\cdot11\cdot12+49\cdot11\cdot12}=\dfrac{10\cdot11}{11\cdot12}=\dfrac{10}{12}=\dfrac{5}{6}\)
7+7-4+5-6+8-9+12+33-55+100-45+55
248
nghĩa trần và các bạn xinh đẹp,học giỏi k cho mk nha
mk nhanh nhất
So sánh: 12^98 và 55^12.
10×11+50×44+70×55 phần 11×12+55×60+77×84
mk ko bt sorry
ai vậy thì k mk nha