помогите решить пример. Created by jamee1. matematika-ru

помогите решить пример...

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A) b=1
39-6b + 19b-18=21+13b=34
b=2
21+13b=21+13*2=21+26=47

b) a=1
15a-13+18a+16= 36a+3=39

a=2
36a+3=75

a=3
36a+3=111

(сначала раскрываешь скобки, потом собираешь x и цифры, потом подставляешь)

2 votes Thanks 1

prorab75

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(39-6*1)+(19*1-18)=33+1=34
(39-6*2)+(19*2-18)=(39-12)+(38-18)=27+20=47

(15a-13)+(18a+16)=(15*1-13)+(18*1+16)=2+34=36
(15*2-13)+(18*2+16)=(30-13)+(36+16)=17+52=69
(15*3-13)+(18*3+16)=(45-13)+(54+16)=32+70=102

1 votes Thanks 1

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