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\(15+15\cdot2+7\cdot15-100\)
\(=15+30+105-100\)
\(=150-100\)
\(=50\)
15 + 15 * 2 + 7 * 15 - 100
= 15 * ( 1+2+7) - 100
= 15*10-10*10
= (15-10) * 10
= 5 * 10
= 50
![](https://rs.olm.vn/images/avt/0.png?1311)
ta gọi số cần tìm là x.
x + 4,75 x 2,5 - 0,2 : 1,25 = 13,84
x + 11,875 - 0,16 = 13,84
x + 11,715 = 13,84
x = 13,84 - 11,715
x = 2,125.
a gọi số cần tìm là x.
x + 4,75 x 2,5 - 0,2 : 1,25 = 13,84
x + 11,875 - 0,16 = 13,84
x + 11,715 = 13,84
x = 13,84 - 11,715
x = 2,125.
![](https://rs.olm.vn/images/avt/0.png?1311)
Bạn ghi vậy là sai rồi , phải có dấu ngoặc như biểu thức sau :
(( x + 4,75 ) x 2,5 - 0,2 ) : 1,25 = 12,84
Tìm một số thập phân. Biết lấy số đó cộng với 4,75 sau đó nhân với 2,5 rồi trừ đi 0,2 thì bằng 17,3.
![](https://rs.olm.vn/images/avt/0.png?1311)
lay 17,3 + 0,2 : 2,5 - 4,75 thi ra so can tim thoi.co gi dau!
Tìm một số thập phân. Biết lấy số đó cộng với 4,75 sau đó nhân với 2,5 rồi trừ đi 0,2 thì bằng 17,3.
![](https://rs.olm.vn/images/avt/0.png?1311)
tớ tính nhanh
17,3 + 0,2 = 17,5 : 2,5 = 7 - 4,75 = 2,25
Đ/S 2,25
725:( a x 2,5 -15)+288,7
Nếu a=10 thì!
725:(10x2,5-15)+288,7
=725:10+288,7
=72,5+288,7
=361,2
Chúc bạn may mắn!!!
viet nhu the a