tim abc biet abc chia 11 bang a cong b cong c
Tim so thap phan a,b biet a khac b va a,b bang (a cong b)chia 2
tim x biet
2/3 chia x/5 cong 5/7 bang 2/7 chia 3/5 cong 9/10
\(\frac{2}{3}:\frac{x}{5}+\frac{5}{7}=\frac{2}{7}:\frac{3}{5}+\frac{9}{10}\)
\(\frac{2}{3}.\frac{5}{x}=\frac{2}{7}.\frac{5}{3}+\frac{9}{10}-\frac{5}{7}\)
\(\frac{10}{3}:x=\frac{10}{21}+\frac{9}{10}-\frac{5}{7}=\frac{100+189-150}{210}=\frac{139}{210}\)
\(x=\frac{700}{139}\)
tim x biet x nhan 2 cong x nhan 3 cong x nhan 4 cong x bang 100
theo bài ra ta có biểu thức :
X x 2 + X x 3 + X x 4 + X = 100
X x 2 + X x 3 + X x 4 + X x 1 =100
X x ( 2 + 3 + 4 + 1 ) =100
X x 10 = 100
X = 100 : 10
X =10 .
Vậy X là 10 .
bai bạn
chúc học tốt
x*2 + x*3 + x*4 + x*5 + x = 100
x*(1+2+3+4+5) = 100
x*10=100
x = 10
Vậy x =10
dấu * là nhân nha bạn
X x 2 + X x 3 + X x 4 + X = 100
X x 2 + X x 3 + X x 4 + X x 1 = 100
X x (2 + 3 + 4 + 1 ) = 100
X x 10 = 100
X = 100 : 10
X = 10
Cho tam giác ABC biet phan giac AD, BC va góc BEC bang goc ADB
CM (goc A cong goc B)chia2 bang goc C
tim n thuoc n biet
f,n cong 15 chia het n tru 4
g,9n cong 23 chia het 3n cong 4
h,48-7n chia het n
k, 5n cong 11 chia het n -1
m,n mu2 cong 8n cong 13 chia het n cong 2
Tim X,biet :a)25/40 bang x/8,b)x cong 15/3 bang34/6
Tim phan so toi gian a/b biet :
a) Cong tu voi 4, cong mau voi 10 thi gia tri phan so ko doi
b) Cong mau vao tu, cong mau vao mau cua phan so thi duoc phan so moi bang 2 lan phan so da cho.
tim 3 so ngguyen to a; b; c khac nhau biet abc<ab cong bc cong aa
CHO 3 SO , BIET RANG SO THU 1 CONG VOI SO THU 2 BANG 579 , SO THU 2 CONG VOI SO THU 3 BANG 1245 , SO THU 3 CONG VOI SO THU 1 BANG 912 . TIM 3 SO DO
tong 3 so la;579+1245+912=2736
so thu nhat va so thu 2 la;2736:2=1368
so thu nhat la;1368-1245=123
so thu 2 la;579-123=456
so thu 3 la;1245-456=789
dap so;123;456;789
123,,456,789