Question

помогите срочно надо  упростите выражение , найдите его  значение:                                                                                                                                                                                                            1) 2(3х+ 5)- (х+7) при х=-1,5                                                                                                ; 2) 0,6(1,5 - 3х) -(4х+ 5) при х=-4

Answer 1

1) 2(3х+ 5)- (х+7)=6х+10-х-7=5х+3
 При х=1,5:
5*1,5+3=7,5+3=10,5

2)0,6(1,5 - 3х)-(4х+ 5)=0,9-1,8х-4х-5=-5,8х-5,9
 При х=-4
-5,8*(-4)-5,9=23,2-5,9=18,3.