nếu làm xong trong tối nay mị sẽ tick và theo dõi nha
B = -3 - 2/3 + 3/5 (-10/9 - 25/3) - 5/6
C = (12/35 - 6/7 + 18/14 : 6/-7 - -2/5-1
D = [(-54/64 - (1/9 : 8/27 :-81/128]
nếu làm nhanh ngay thì tick và followwwww
B = -3 - 2/3 + 3/5 (-10/9 - 25/3) - 5/6
C = (12/35 - 6/7 + 18/14 : 6/-7 - -2/5-1
D = [(-54/64 - (1/9 : 8/27 :-81/128]
a) 2^7 . 9^3 / 6^5 . 8^2
b) 6^10 . 27^5 / 4^5 . 81^6
c) 3^18 . 32^9 / 64^7 . 27^6
d) 9^12 . 3^5 + 9^15 / ( 2. 27 )^5 . 3^14
e) 5^4 + 2^2 . 5^2 - 125 / 2^3 . 3
a) 2^7 . 9^3 / 6^5 . 8^2
= 2^7 . 3^9 / 2^5 . 3^5 . 2^6
= 2^-4 . 3^4
Thực hiện các phép tính sau
\(A=\frac{1}{2}-\frac{3}{4}+\frac{5}{6}-\frac{7}{12}\)|
\(B=-3-\frac{2}{3}+\frac{3}{5}\left(-\frac{10}{9}-\frac{25}{3}\right)-\frac{5}{6}\)
\(C=\left(\frac{12}{35}-\frac{6}{7}+\frac{18}{14}\right):\frac{6}{-7}-\frac{-2}{5}-1\)
\(D=\left[\frac{-54}{64}-\left(\frac{1}{9}:\frac{8}{27}\right):\frac{-1}{3}\right]:\frac{-81}{128}\)
\(E=\left[\frac{193}{-17}\left(\frac{2}{193}-\frac{3}{386}\right)+\frac{11}{34}\right]:\left[\left(\frac{7}{1931}+\frac{11}{3862}\right)\frac{1931}{25}+\frac{9}{2}\right]\)
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A = \(\frac{1}{2}-\frac{3}{4}+\frac{5}{6}-\frac{7}{12}\)
A = \(\left(-\frac{1}{4}\right)+\frac{5}{6}-\frac{7}{12}\)
A = \(\frac{7}{12}-\frac{7}{12}\)
A = \(0\).
Mình làm câu A thôi nhé.
Chúc bạn học tốt!
Tính nhanh các biểu thức sau:
A.5= (-2/5+3/10) : (2/-5+|-4/3-2|)
B.5= |-2/3+3/2|(-4/5-|-3/-2 -1|)
C.5= |-3 (-13/15 - 17/21)| - |-13/5 + 17/7| + (-12+35/3) : |-7/6|
D.5= [(-2/3 + 3/4 -2) ÷ (2/3 + -3/4 -2)] × [(-2/3-3/4 -2) ÷ (2/3+3/4 +2)]
C.1 = (12/35- 6/7+ 18/14) : 6/-7 - -2/5 -1
E.1= [193/-17. (2/193 - 3/386) + 11/34] ÷ [(7/1931 + 11/3862).1931/25 + 9/2]
Các bạn đừng để ý mấy các D.2, C.6,....nha Nó chỉ mang tính đánh đấu bài để dễ tìm. Đề hơi dài ( đánh máy = ipad nên muốn gãy tay luôn! >¤<) nếu thấy có người làm câu 1 or 2 or 3 or... thì đừng lặp lại nhé mà làm câu tiếp theo nha ( trừ khi câu đó sai)# ab/c là 1 hỗn số
D.1= [-54/64 - (1/9 : 8/27) : -1/3] : -81/128
F.1= (53/4 - 25/27 - 65/6). (230+1/25)+ 463/4 : (24/7 + 31/3) : (121/3 - 14 2/7)
a: \(=\left(\dfrac{-4}{10}+\dfrac{3}{10}\right):\left(\dfrac{-2}{5}+\dfrac{10}{3}\right)\)
\(=\dfrac{-1}{10}:\dfrac{-6+50}{15}=\dfrac{-1}{10}\cdot\dfrac{15}{44}=\dfrac{-3}{88}\)
b: \(=\left|\dfrac{-4+9}{6}\right|\cdot\left(-\dfrac{4}{5}-\dfrac{5}{2}\right)\)
\(=\dfrac{5}{6}\cdot\dfrac{-33}{10}=\dfrac{-1}{2}\cdot\dfrac{11}{2}=-\dfrac{11}{4}\)
c: \(=\left(\dfrac{12}{35}-\dfrac{6}{7}+\dfrac{9}{7}\right)\cdot\dfrac{-7}{6}+\dfrac{7}{5}\)
\(=\left(\dfrac{12}{35}+\dfrac{3}{7}\right)\cdot\dfrac{-7}{6}+\dfrac{7}{5}\)
\(=\dfrac{12+15}{35}\cdot\dfrac{-7}{6}+\dfrac{7}{5}\)
\(=\dfrac{27}{35}\cdot\dfrac{-7}{6}+\dfrac{7}{5}=\dfrac{1}{2}\)
Kết hợp ( ) nếu có => nhân chia => cộng trừ
A) 2/3 + 1/5 . 10/7
B) 2/7 + 5/7 . 14/25
C) 7/12 - 27/7 . 1 /18
D) 3/10 . ( -5/6 ) - 1/8
E) (-4/-9) . 3/8 + 1/18
F) 2/7 + 28/27 : ( -4/-9 )
G) ( 1/2 - 2/3 ) . 4/5
H) 9/7 . ( 3/7 - 1/2 )
Mk đang cần đáp án gấp nên b nào tl nhanh nhất mình sẽ tick !
Tính nhanh:
a,1/4+2/5+6/8+9/15+8/1
b,1/2+2/4+3/6+4/8+5/10+6/12+7/14+8/16+9/18+10/20
c,1/10+4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
a; \(\dfrac{1}{4}\) + \(\dfrac{2}{5}\) + \(\dfrac{6}{8}\) + \(\dfrac{9}{15}\) + \(\dfrac{8}{1}\)
= (\(\dfrac{1}{4}\) + \(\dfrac{6}{8}\)) + (\(\dfrac{2}{5}\) + \(\dfrac{9}{15}\)) + \(\dfrac{8}{1}\)
= (\(\dfrac{1}{4}\) + \(\dfrac{3}{4}\)) + (\(\dfrac{2}{5}\) + \(\dfrac{3}{5}\)) + 8
= 1 + 1 + 8
= 2 + 8
= 10
b; \(\dfrac{1}{2}\) + \(\dfrac{2}{4}\) + \(\dfrac{3}{6}\) + \(\dfrac{4}{8}\) + \(\dfrac{5}{10}\) + \(\dfrac{6}{12}\) + \(\dfrac{7}{14}\) + \(\dfrac{8}{16}\) + \(\dfrac{10}{20}\)
= \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) x (\(\dfrac{2}{2}\) + \(\dfrac{3}{3}\) + \(\dfrac{4}{4}\) + \(\dfrac{5}{5}\)+ \(\dfrac{6}{6}+\dfrac{7}{7}+\dfrac{8}{8}\) + \(\dfrac{10}{10}\))
= \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) x (1 + 1 +1 + 1+ 1+ 1+ 1 +1)
= \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) x 1 x 8
= \(\dfrac{1}{2}\) + \(\)\(\dfrac{1}{2}\) x 8
= \(\dfrac{1}{2}\) + 4
= \(\dfrac{9}{2}\)
Tính nhanh:
a,1/4+2/5+6/8+9/15+8/1
b,1/2+2/4+3/6+4/8+5/10+6/12+7/14+8/16+9/18+10/20
c,1/10+4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
a)(5+1/5-2/9)-(2-1/23-3/35+5/6)-(8+2/7-1/18)
b) 1/3-3/4(-3/5+1/64- -2/9-1/36+1/15
c) -5/7-(-5/67)+13/10+1/2+(-1/6)+1 3/14-(-2/5)
d)3/5:(-1/15-1/6)+3/5:(-1/3-1 1/15)