Question

Afla nr necunoscut din:
(a+6)×10+7×9=143;;(7×6×15-20×30)-2×c=10;;(b-32)÷19-15÷5=0 si 72÷8×10+(d-6×6)=94

Answer 1

Răspuns:

Explicație pas cu pas:

(a+6)×10+7×9=143

b×10+7×9=143

c+7×9=143

c+63=143

c=143-63

c=80

b×10=80

b=80÷10

b=8

a+6=8

a=8-6

a=2

(7×6×15-20×30)-2×c=10

(42×15-600)-2×c=10

(630-600)-2×c=10

30-2×c=10

30-y=10

y=30-10

y=20

2×c=20

c=20÷2

c=10

(b-32)÷19-15:5=0

c÷19-15÷5=0

t-3=0

t=0+3

t=3

c÷19=3

c=19×3

c=57

b-32=57

b=57+32

b=89

72÷8×10+(d-6×6)=94

72÷8×10+(d-36)=94

72÷8×10+c=94

9×10+c=94

90+c=94

c=94-90

c=4

d-36=4

d=4+36

d=40