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tổng cua 3 số là:
35 x 3 = 105
a + b = 60
b + c = 65
a + b + b +c = 60 + 65 = 125
số thứ 2 ( b ) là:
125 - 105 = 20
số thứ 1 là:
60 - 20 = 40
số thứ 3 là:
65 - 20 =45
Đáp số : ....
k nhé mn!
tổng ba số là:
35*3=105
số thứ ba là:
105-60=45
số thứ hai là:
65-45=20
số thứ nhất là:
60-20=40
đáp số:số thứ nhất:40,số thứ hai:20,số thứ ba:45
bai giai
Tong cua ba so do la:
35 x 2 =70
So thu ba la:
70 - 60 = 10
So thu nhat la:
70 - 65 = 5
So thu hai la:
70 - (10 + 5 ) = 55
dap so : so thu nhat la : 5
so thu hai la : 55
so thu ba la : 10
Hai thùng dầu chứa 40 l dầu. Nếu lấy 5l ở thùng thứ nhất đổ vào thùng thứ hai thì số dầu chứa trong hai thùng bằng nhau. Hỏi mỗi thùng chứa bao nhiêu lít dầu?
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
Lời giải:
Tổng số thứ nhất và hai: $32\times 2=64$
Tổng số thứ hai và ba: $36\times 2=72$
Tổng số thứ nhất và ba: $30\times 2=60$
Tổng 3 số: $(64+72+60):2=98$
Số thứ 3 là: $98-64=34$
Số thứ nhất là: $98-72=26$
Số thứ hai là: $98-60=38$
Đáp án B.
Bài giải :
Tổng ba số đó là :
43756 x 3 = 131268
Số thứ hai là :
69708 x 1/2 = 34854
Số thứ ba là :
131268 - 69708 - 34854 = 26706
Đáp số : 26706.
Tổng của 3 số là
43756*3=131268
Số thứ 2 là
69708:2=34854
Số thứ 3 là
131268-34854-69708=26706
Đ/S: 26706
Tổng của số thứ nhất và số thứ hai là: 193 x 2 = 386
Tổng của số thứ nhất và số thứ ba là: 244 x 2 = 488
Tổng của số thứ hai và thứ ba là: 256 x 2 = 512
Tổng của 3 số là ( 386 + 488 + 512) : 2 = 693
Số thứ hai là: 693 - 488 = 205
Đ/S: 205
tổng của ba số là : \(65\times3=195\)
Số còn lại là : \(195-126=69\)
vậy chọn đáp án C
đặt ẩn rồi giải phương trình