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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
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.
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.
lay 17,3 + 0,2 : 2,5 - 4,75 thi ra so can tim thoi.co gi dau!
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