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a) a+234= 567
=> x= 567-234
=>x= 333
b) x+891= 2345
=> x= 2345-891
=>x= 1454
x + 234 = 567
x = 567 - 234
x = 333
x + 891 = 2345
x = 2345 - 891
x = 1454
k mk nha bạn ơi
Chúc bạn học tốt !
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x + x + x + 5 * x + 2 = 891
x * 1 + x * 1 + x * 1 + 5 * x + 2 = 891
x * ( 1 + 1 + 1 + 5 ) = 891 - 2
x * 8 = 889
x =889 :8
x = 111,125
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\(\text{555 + 999 + 777 = ?}\)
\(\text{Trả lời :}\)
\(\text{555 + 999 + 777 = 2331}\)
\(\text{Chúc bạn học tốt !}\)
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1 + 0 + 1 + 2 + 3 + 4 + 56 + 69 + 7 + 96 + 6 + 666 + 999 + 54 + 989 x ( 9 x 99 - 981 )
= 1 + 0 + 1 + 2 + 3 + 4 + 56 + 69 + 7 + 96 + 6 + 666 + 999 + 54 + 989 x 981 - 981
= 1 + 0 + 1 + 2 + 3 + 4 + 56 + 69 + 7 + 96 + 6 + 666 + 999 + 54 + 989 x 0
= 0
233 + 768 = 1001
263 + 777 = 1040
657 + 891 = 1548