раскрыть скобки и привести подобные слагаемые:
1) 9(7х-6)-18х
2) 7а-6(19-а)
3) 0,6(4х-18)-0,4(5-7х)
1) 9(7х-6)-18х
2) 7а-6(19-а)
3) 0,6(4х-18)-0,4(5-7х)
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Answers & Comments
2) 7а-6(19-а)=7a-114+6a=13a-114
3) 0,6(4х-18)-0,4(5-7х)=2,4x-10,8-2+2,8x=5,2x-12,8
9(7х-5)-18х = 63х -54 18х= 45х -54 = 9(5х-6)
2.
7а-6(19-а) = 7а -114 +6а = 13а -114
3.
0,6(4х-18) -0,4(5-7х) = 2,4х - 10,8 - 2 + 2,8х = 5,2х -12,8