a, ( 4,578 x 3 +5,422 x 3 ) : 1,2 -1,2
= [ 3 x ( 4,578 +5,422 ) ] : 1,2 -1,2
= ( 3 x 10 ) : 1,2 -1,2
= 30 : 1,2 -1,2
= 25 -1,2
= 23,8
b, \(\frac{3}{5}\)x\(\frac{9}{7}\)-\(\frac{3}{5}\)x\(\frac{3}{14}\)
= \(\frac{3}{5}\)x ( \(\frac{9}{7}\)- \(\frac{3}{14}\))
= \(\frac{3}{5}\)x\(\frac{15}{14}\)
= \(\frac{9}{14}\)
Chúc bạn học tốt
(4,578 x 3 + 5,422 x 3 ) : 1,2 - 1,2
=( 3 x [4,578 + 5,422 ] : 1,2 - 1,2
=(3 x 10) : 1,2 - 1,2
=30 : 1,2 - 1,2
=25-1.2
=23.8
b) 3/5 x 9/7 - 3/5 x 3/14
=3/5x(9/7-3/14)
=3/5x15/14
=9/14
A, Ta có :
( 4,578 . 3 + 5,422 . 3 ) : 1,2 - 1,2 .
= [ 3 . ( 4,578 + 5,422 ) ] : 1,2 - 1,2 .
= [ 3 . 10 ] : 1,2 - 1,2 .
= 30 : 1,2 - 1,2 .
= 25 - 1,2 .
= 23,8 .
B, Ta có :
3/5 . 9/7 - 3/5 . 3/14 .
= 3/5 . ( 9/7 - 3/14 ) .
= 3/5 . ( 18/14 -3/14 ) .
= 3/5 . 8/7 .
= 24/35 .