Упростите выражение:
1) -2,4m * (-3n)
2) -8a - 12b + 5a + 11b
3) a - (a+5) + (-7+a)
4) -5 * (y - 4) + (y + 5)
1) -2,4m * (-3n)
2) -8a - 12b + 5a + 11b
3) a - (a+5) + (-7+a)
4) -5 * (y - 4) + (y + 5)
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1) -2,4m * (-3n)=7,2mn;/// 2) -8a - 12b + 5a + 11b= -3a-b;/// 3) a - (a+5) + (-7+a)= a-a-5-7+a=-12+a;//// 4) -5 * (y - 4) + (y + 5)= -5y+20+y+5= -4y+252)
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