Mihaelabejnaruid
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21. Aflaţi termenul necunoscut x din:
a) x + 45 = 87;
f) 345 + 123 = x +235;
b) x + 1235 = 7325;
g) 3104 - (415 - x) = 3000;
c) 13702 - x=12721;
h) 42 + (x - 24) = 2302;
d) x - 3514 = 7235,
i) 2345 - 1234 + x = 7213 - 2513
e) 123 + x +45 = 268;
j) 350 - x=472 - 389.
a) - d) (nota 5)​

Răspuns :

Alexandrarriid

Explicație pas cu pas:

a) x+45=87

x=87-45

x=42

f) 345+123=x+235

468=x+235

x=468-235

x=233

b) x+1235=7325

x=7325-1235

x=6090

g) 3104-(415-x)=300

-415+x=3104-300

-415+x=2804

x=2804+415

x=3219

c) 13702 - x=12721

x=13702-12721

x=981

h) 42 + (x - 24) = 2302

x-24=2302-42

x-24=2260

x=2260-24

x=2236

d) x - 3514 = 7235

x=7235+3514

x=10749

i) 2345 - 1234 + x = 7213 - 2513

1111+x=4700

x=4700-1111

x=3859

e) 123 + x +45 = 268

165+x=268

x=268-165

x=103

j) 350 - x=472 - 389.

350-x=83

x=350-83

x=267