a) 739 x 2 + 739 + 739 x 3 + 739 x 4
= 739 x 2 + 739 x 1 + 739 x 3 + 739 x 4
= 739 x ( 2 + 1 + 3 + 4 )
= 739 x 10
= 7390
b) \(\frac{1}{7}\) + \(\frac{2}{7}\) + \(\frac{3}{7}\)+ \(\frac{4}{7}\) + \(\frac{5}{7}\) + \(\frac{6}{7}\)
= ( \(\frac{1}{7}\) + \(\frac{6}{7}\) ) + ( \(\frac{2}{7}\) + \(\frac{5}{7}\) ) + ( \(\frac{3}{7}\)+ \(\frac{4}{7}\) )
= \(1\) \(+\) \(1\) \(+\) \(1\)
= \(3\)
~ Hok T ~
đ/s là 287 nha bạn
nhầm mik viết lộn câu hỏi trên cơ
a, = 739 x ( 2+3+4)
= 739 x 9
= 6651
Tính bằng cách thuận tiện nhất
a, 739 x 2 + 739 + 739 x 3 + 739 x 4
= 739 x 2 + 739 x 1 + 739 x 3 + 739 x 4
= 739 x ( 1 + 2 + 3 + 4 )
= 739 x 10
= 7390
B. \(\frac{1}{7}\)+ \(\frac{2}{7}\)+\(\frac{3}{7}\)+ \(\frac{4}{7}\)+ \(\frac{5}{7}\)+ \(\frac{6}{7}\)
Cách 1:
= \(\frac{1+2+3+4+5+6}{7}\)
= \(\frac{21}{7}\)
Cách 2:
= ( \(\frac{1}{7}\)+ \(\frac{6}{7}\)) + (\(\frac{2}{7}\)+ \(\frac{5}{7}\)) + (\(\frac{3}{7}\)+ \(\frac{4}{7}\))
= \(1+1+1\)
= \(3\)
Hok tốt
a. 739x2 + 739 + 739x3 + 739x4
= 739 x (2 + 1 + 3 + 4 )
= 739 x 10
= 7390
b.\(\frac{1}{7}+\frac{2}{7}+\frac{3}{7}+\frac{4}{7}+\frac{5}{7}+\frac{6}{7}\)
\(=\left(\frac{1}{7}+\frac{6}{7}\right)+\left(\frac{2}{7}+\frac{5}{7}\right)+\left(\frac{3}{7}+\frac{4}{7}\right)\)
\(=1+1+1\)