$\textit{Ta phải tìm hiệu trước, sau đó mới tìm thừa số nhez}$
`x xx 7=4278-29`
`→x xx 7 =4249`
`→x =4249:7`
`→x=607`
`Vậy` `x=607`
Đáp án+Giải thích các bước giải:
bài 2:
X x 7 =4278-29
⇒ X x 7=4249
⇒X=4249:7
⇒X=607
Vậy x=607
Chúc em hc tốt!
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