2.Упростите выражение, сложив подробные слагаемые: а)-8m-(-10m)+13m-24m=
б)1.25a+2a2(-0,85a)-(-3a)-3a=
в) 11/21n-2/21n-19/21n+5/21n
3.Определите знак произведения:
(-7)²·(-3)·(-2 11/90)·(-7)·(-0,5)·2,88·(-3²)
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