xet 1/4x7 +1/7x10+...+1/37x40
dat bieu thuc tren la A ta co:
A=1/4x7+1/7x10+...+1/37x40
3A=3/4X7+3/7X10+...+3/37X40
3A=1/4-1/71/7-1/10+...+1/37-1/40
3A=1/4-1/40
3A=10/40-1/40=9/40
A=9/40:3=9/120=3/40
=> (1/4x7+1/7x10+...+1/37x40)-x=4/5
3/40-x=4/5
x=3/40-4/5=-29/40
Tim x biet :
a, |2x+1|-x=5
b, |x-10|10+|x-11|10=1
Trinh bay cach lam ro rang cho minh nhe
Chieu phai nap roi
Ai trinh bay ro rang nhat minh se tick
Tính tổng : S= 3/1x4 + 3/4x7 + 3/7x10 + ........... + 3/37x40
tim x thuoc Z biet:
|x-5|+x+3=16
|x-4|>x+2
||x+5|-4|=3
Cach lam nua nhe
minh chua biet cach lam,cac ban phaiviet cach lam vao minh moi tick
ko bat buoc lam tat ca cac cau
tim x thuoc Z biet
a)5-x+12=4+x+1
b)4x-5+(-15)=3x-10
cac ban nho ghi cach lam nha
Tim cac so nguyen x,y(y>0) biet |xm^2-1|+(y^2-3)=2 tim x nho cach lam nua nha
A=7/1x9 +7/9x17+7/17x25+.....+7/81x89
B=5mũ2/1x4 +3mũ2/4x7+3mũ2+7x10+....+3mũ2/37x40
Ghi các bước tính ra ạ
Tim x
|2.x-1|-1=2
Chu y : bai nay co 2 dap an la 2;(-1)nhung minh k biet cach trinh bay. Ai lam nhanh, gọn minh tick cho
Tim x biet:
a,10+x / x+17=3 / 4
b'40+x / 77-x=6/7
Lam nhanh va cach lam day du minh se tick
tim so nguyen x , biet :
/3 - 2x / < 2
CO CACH LAM NUA NHA CAC BN , AI GIAI DUNG MK TICK
