Question

Решить уравнения с проверкой 540/(17-x)=60 t*7-80=340 (8*y-30)/9=50 (350/b+10)*7=560

Answer 1

540:(17-х)=60

17-х=540:60

17-х=9

х=17-9

х=8

проверка

540:(17-8)=60

540:9=60

60=60

t*7-80=340

t*7=340+80

t*7=420

t=420:7

t=60

проверка

60*7-80=340

420-80=340

340=340

(8*у-30):9=50

8*у-30=50*9

8*у-30=450

8*у=450+30

8*у=480

у=480:8

у=60

проверка

(8*60-30):9=50

(480-30):9=50

450:9=50

50=50

(350:b+10)*7=560

350:b+10=560:7

350:b=80-10

350:b=70

b=350:70

b=5

проверка

(350:5+10)*7=560

(70+10)*7=560

80*7=560

560=560

Answer 2

$540:(17-x)=60$

$17-x=540:60$

$17-x=9$

$x=17-9$

$x=8$

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$540:(17-8)=60$ (это проверка)

$540:9=60$

$60=60$

============================================

$t\cdot7-80=340$ 

$t\cdot7=340+80$

$t\cdot7=420$

$t=420:7$

$t=60$

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$60\cdot7-80=340$

$420-80=340$

$340=340$

============================================

$(8y-30):9=50$

$8y-30=50\cdot9$

$8y-30=450$

$8y=450+30$

$8y=480$

$y=480:8$

$y=60$

___________________________________________

$(8\cdot60-30):9=50$

$(480-30):9=50$

$450:9=50$

$50=50$

===========================================

$(350:b+10)\cdot7=560$

$350:b+10=560:7$

$350:b=80-10$

$350:b=70$

$b=350:70$

$b=5$

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$(350:5+10)\cdot7=560$

$(70+10)\cdot7=560$

$80\cdot7=560$

$560=560$