Toán Lớp 7: Tính:
a, 10ab-7a+9b-5ab-5a
b, 73ab-(92abc-4ab)-57abc+abc-45b
c, 6a+(2a-3b)-(4ab-2b)
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Toán Lớp 7: Tính:
a, 10ab-7a+9b-5ab-5a
b, 73ab-(92abc-4ab)-57abc+abc-45b
c, 6a+(2a-3b)-(4ab-2b)
Comments ( 1 )
$a,$ $10ab-7a+9b-5ab-5a$
$=10ab-5ab-7a-5a+9b$
$=5ab-7a-5a+9b$
$=5ab-12a+9b$
$b,$ $73ab-\left(92abc-4ab\right)-57abc+abc-45b$
$=73ab-\left(92abc-4ab\right)-56abc-45b$
$=73ab-92abc+4ab-56abc-45b$
$=73ab+4ab-92abc-56abc-45b$
$=77ab-92abc-56abc-45b$
$=77ab-148abc-45b$
$c,$ $6a+\left(2a-3b\right)-\left(4ab-2b\right)$
$=6a+2a-3b-\left(4ab-2b\right)$
$=8a-3b-\left(4ab-2b\right)$
$=8a-3b-4ab+2b$
$=8a-3b+2b-4ab$
$=8a-b-4ab$