\(\frac{2}{3}-\frac{5}{7}\cdot\frac{14}{25}\)
\(=\frac{2}{3}-\frac{5\cdot7\cdot2}{7\cdot5\cdot5}\)
\(=\frac{2}{3}-\frac{2}{5}\)
\(=\frac{10}{15}-\frac{6}{15}\)
\(=\frac{4}{15}\)
\(\frac{2}{3}-\frac{5}{7}\cdot\frac{14}{25}\)
\(=\frac{2}{3}-\frac{5\cdot7\cdot2}{7\cdot5\cdot5}\)
\(=\frac{2}{3}-\frac{2}{5}\)
\(=\frac{10}{15}-\frac{6}{15}\)
\(=\frac{4}{15}\)
a,2phan3 - 5phan7. 14phan25
b -2phan5.5phan8➕5phan8.3phan5
c,25%➖1½➕0,5.12phan5
Thực hiện phép tính A=55:{(4mu2+1)x[2phan3:(5phan7-2 1phan 3)]:[(300%+500%)mu2+trị tuyệt đối của -3phan2]}
thuc hien phep tinh :
a) 28/11 . 21/22 . 9
thuc hien phep tinh
a)158+(-151)-85+12
1,thuc hien phep tinh hop li
a,187+[923-(923+887)]
B, 39.187+30^2-78.39
giup minh giai nhung thuc hien phe tinh nha
Thuc hien phep tinh :
a, 126 + (-20) + |124| -(-320) - |-150|
Thuc hien phep tinh C +XXVIII
(155.155-155.41)/114 .thuc hien phep tinh
thuc hien phep tinh
a A=1.2.3....9-1.2.3....8-1.2.3...8.8