Đáp án: Số lớn là 40
Số bé là 30
Giải thích các bước giải:
Số lớn là:
(70+10):2=40
Số bé là:
(70-10):2=30
Đáp số: Số lớn là 40
Số bé là 30.
Đáp án: 40 và 30
Giải thích các bước giải: gọi x và y là 2 số cần tìm
Ta có pt:
X+y=70 và x-y=10
Rút x+y=70 =>x=70-y
Thay x=70-y vào pt x-y=70
Ta tính được y=30, lấy 30+10=40=x
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