Tính nhanh
4/5 × 3/7 + 4/5 × 6/7 - 4/5 × 4/14
Làm rõ ai nhanh mik tik
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(3-1/4+2/3) - (5+1/3-6/5) - (6-7/4+3/2) = 3-1/4+2/3 -5 +1/3 + 6/5 -6 + 7/4 - 3/2
= (3-5-6) + (-1/4 +7/4) + ( 2/3+1/3) + ( 6/5-3/2)
=(-8) + 2+1+ (-3/10)
=5,3
1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10x9/10
=9/10x(1/2+2/3)+(3/4+4/5)+(5/6+6/7)+(7/8+8/9)
=9/10x(1/3+3/5+5/7+7/9)
9/10x(1/3+3/5)+(5/7+7/9)
=9/10x1/5+5/9
9/50+5/9
=10
Bn Long làm đúng rồi bn nguyễn kim arica cứ làm theo cách đó là được .
Bn nào thấy đúng thì ủng hộ nha .
1 + 2 + ... + 9 + 10 x 0 + 1 + 2 + 4 + 3
= 45 + 0 +10
= 55
Chúc bạn học tốt !!!
Bài làm
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 x 0 + 1 + 2 + 4 + 3
= 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 0 + 1 + 2 + 4 + 3
= ( 1 + 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + ( 5 + 1 + 2 + 3 ) + 4 + 0
= 10 + 10 + 10 + 10 + 10 + 4
= 54
# Chúc bạn học tốt #
=20^7+20^6+10^5+20^4+10^3+90^2+40+4
=1280000000+6400000+100000+16000+1000+8100+44
=1286400000+116000+9144
=1286516000+9144
=1286525144
Chuẩn ko cần phải chỉnh
\(\left(3-\frac{1}{4}+\frac{2}{3}\right)-\left(5+\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)
\(=3-\frac{1}{4}+\frac{2}{3}-5-\frac{1}{3}+\frac{6}{5}-6+\frac{7}{4}-\frac{3}{2}\)
\(=\left(3-5-6\right)+\left(-\frac{1}{4}+\frac{7}{4}-\frac{3}{2}\right)+\left(\frac{2}{3}-\frac{1}{3}\right)+\frac{6}{5}\)
\(=-8+\frac{1}{3}+\frac{6}{5}\)
\(=-\frac{97}{15}\)
= 3 - 1/4 +2/3 - 5 - 1/3 + 6/5 - 6 + 7/4 - 3/2
= 2/3 . -3/2 . ( 3 + 5 + 6 ) . ( 2/3 + 1/3 ) . ( -1/4 - 7/4)
= -1 . 14 . 1 . 6/4
= -14 . 1 . 6/4
= -14 . 6/4
= -84/4 = -21
\(1,\frac{5}{7}+\frac{3}{14}=\frac{10}{14}+\frac{3}{14}=\frac{13}{14}\)
\(2,\frac{11}{12}-\frac{5}{6}=\frac{11}{12}-\frac{10}{12}=\frac{1}{12}\)
\(3,6.\frac{5}{8}=\frac{30}{8}=\frac{15}{4}\)
\(4,\frac{4}{5}:\frac{3}{7}=\frac{4.7}{5.3}=\frac{28}{15}\)
5/7+3/14=13/14
11/12-5/6=1/12
6*5/8=30/8
4/5:3/7=28/15
\(\frac{3}{4}x\frac{4}{5}:\frac{3}{5}x\frac{6}{7}:\frac{1}{7}x\frac{5}{6}\)\(=\)\(\frac{3}{4}x\frac{4}{5}x\frac{5}{3}x\frac{6}{7}x\frac{7}{1}x\frac{5}{6}\)\(=\)\(\frac{3x4x5x6x7x5}{4x5x3x7x1x6}\)\(=\)\(\frac{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x5}{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x1}\)\(=\)\(\frac{5}{1}\)\(=\)\(5\).
= 4/5* (3/7+6/7-4/14)
=4/5*14/14
=4/5*1
=4/15
=4/5x(3/7+6/7-4/14)
=4/5x1
=1