Упростите выражение и найдите его коэффициэнт 2,1а×(-7) -3а×(-9в)×с​

X(в 3 степени) - 4х (2 степени) -4х +16=0
х (2 степени) (х-4)-4(х-4)=0
(х-4)(х-2)(х+2)=0
х1=4
х2=2
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3 1/3 x +2 3/8 х -(1 1/4х + 3 7/12х), если х =48

3 1/3*48+2 3/8*48 -(1 1/4*48 + 3 7/12*48)= 42
1)3 1/3*48=10/3*48=160
2)2 3/8*48=19/8*48=114
3)160+114=274
4)1 1/4*48=5/4*48=60
5)3 7/12*48=43/12*48=172
6)60+172=232
7)274-232=42

3 1/3 x +2 3/8 х -(1 1/4х + 3 7/12х),
х=2 2/7
3 1/3*2 2/7+2 3/8*2 2/7 -(1 1/4*2 2/7+ 3 7/12*2 2/7=4 6/7

1)3 1/3*2 2/7=10/3*16/7=160/21
2)2 3/8*2 2/7=19/8*16/7=38/7
3)160/21+38/7=160/21+114/21=274/21
4)1 1/4*2 2/7=5/4*16/7=20/7
5)3 7/12*2 2/7=43/12*16/7=172/21
6)274/21-172/21=102/21=4 18/21=4 6/7