1234x567-667/567+1234x566
45x16-17/45x15+28
667x874+251/678x874-623
Tính nhanh :
1234x567-667
567+1234+566
Tính nhanh
a)4/5x9/7-4/5x3/14
b)13/50+9%+41/100+24%
c)678x874+251/678x874-623
Trả lời
a)4/5.9/7-4/5.3/14
=4/5(9/7-3/14)
=4/5(18/14-3/14)
=4/5.15/14
=6/7
b)13/50+9%+41/100+24%
=13/50+9/100+41/100+24/100
=26+9+41+24/100
=(26+24)+(9+41)/100
=100/100
=1
\(\frac{4}{5}\cdot\frac{9}{7}-\frac{4}{5}\cdot\frac{3}{14}\)
=\(\frac{4}{5}\cdot(\frac{9}{7}-\frac{3}{14})\)
=\(\frac{4}{5}\cdot\frac{15}{14}\)
=\(\frac{6}{7}\)
b,\(\frac{13}{50}\)+9%+\(\frac{41}{100}\)+24%
=26%+9%+41%+24%
=100%=1
Tính nhanh
1234x567-667/567+1234+566
\(\frac{1234x567-667}{567+1234x566}+\frac{7}{9}\)
Tính \(A=\frac{1234x567-667}{567+1234x566}\)
1234x567-667=699011=1
567+1234x566=699011=1
Tính nhanh:
1234x567-667 / 567+1234+566
\(\frac{1234\times567-667}{567}+1234+566\)
\(=\frac{1234\times567-567-100}{567}+1234+566\)
\(=\frac{1234\times567}{567}-\frac{567}{567}-\frac{100}{567}+1234+566\)
\(=1234-1-\frac{100}{567}+1234+566\)
\(=1234\times2+564+\left(1-\frac{100}{567}\right)\)
\(=3032+\frac{467}{567}=3032\frac{467}{567}\)
\(\frac{1234x567-667}{5677+1234x566}\)
= 1234x(566+1)-667 / 5677+ 1234 x 566
= 1234x566 + 1234x1 - 667 / 5677 + 1234 x 566
bớt 2 vế đi cho 1234x566
ta có ; 1234
5677
Tính nhanh giá trị của biểu thức:
A=677x847=252 / 678x874-623
1234x567-667/567x1234-556
làm giúp hộ mình nhé mai mình phải nộp rồi