Выполнить действия. 7 класс
3b 5b
___ - ________
8a 12a
2). c d
______+ ________
24mn 18nt
3b 5b
___ - ________
8a 12a
2). c d
______+ ________
24mn 18nt
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Verified answer
1) 3b/8a - 5b/12a = 3b*3 / 8a*3 - 5b*2 / 12a*2 = 9a/24a - 10b/24a == 9a-10b / 24a
2) c / 24mn + d / 18nt = с*3t / 24mn*3t + d*4m / 18nt*4m =
= 3ct/72mnt + 4dm/72mnt = 3ct+4dm / 72mnt