Помогите пожалуйста. 1.Упростите выражения.
1) 8,7+(13,7-15,2)-(24,6-2,01)=
2) 2/3*(6/9с-1 целая 1/2d)-4,8*(5/8-2,5d)=
2.Решить уравнения.
1) 0,4*(х-9)-0,3*(х+2)=0,7
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