3+x=2x-1/2
x-2x=-1/2-3
-1x=-7/2
x=-7/2:-1
x=7/2
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tren tia Ox lay 2 diem A va B sao cho OA 2cm , OB 7cm . Tren tia BA diem lay diem C sao cho BC 3 cm .Khi do CA ....cm cho xôy 80 ^0 . Tia O z la tia doi cua tia Ox , tia Ot la tia doi cua tia Oy .Khi do zOt ......^0 mot vuon trong 420 cay an qua , trong do 2 phan 5 la cam , 50 % la hong xiem con lai la buoi . Vay so cay buoi la ... cay tim x biet 5phan 8 x - 1 phan 8 23 phan 4 . Tra loi x ...... ( Nhap ket qua dang so thap phan gon nhat )ba tam vai co tong chieu dai la 126 cm .Tam thu...
Đọc tiếp
tren tia Ox lay 2 diem A va B sao cho OA = 2cm , OB = 7cm . Tren tia BA diem lay diem C sao cho BC = 3 cm .Khi do CA = ....cm
cho xôy = 80 ^0 . Tia O z la tia doi cua tia Ox , tia Ot la tia doi cua tia Oy .Khi do zOt = ......^0
mot vuon trong 420 cay an qua , trong do 2 phan 5 la cam , 50 % la hong xiem con lai la buoi . Vay so cay buoi la ... cay
tim x biet 5phan 8 x - 1 phan 8 = 23 phan 4 . Tra loi x =...... ( Nhap ket qua dang so thap phan gon nhat )
ba tam vai co tong chieu dai la 126 cm .Tam thu nhat dai gap hai lan tam thu ba va ngan hon tam thu hai la 6 m . Khi do do dai tam giai thu ba la........cm
tim x biet 5 ( x + 35 ) = 115 tra loi x = .....
tim x biet (x - 5) .3 = 3 ^3 tra loi x =.......
so tu nhien lon nhat co bon chu so sau cho khi chia cho 11;13;17 deu du 7 la ......
tim số nguyen duong nho nhat thoa man mot phan 2 so do la so chinh phuong,mot phan 3 so do la luy thua bac 3 cua 1 so nguyen, mot phan 5 so do la luy thua bac 5 cua 1 so nguyen
1.Tim cac so tu nhien x sao cho:a/6 chia het cho (x-1) b/14 chia het cho (2.x+3)2.Ve hinh de thay rang moi cau sau day la saia/Hai tia chung goc luon la hai tia doi nhaub/Hai tia chung goc luon la hai tia trung nhauc/Hai tia chung hoc luon la hai tia phan bietd/Hai tia co nhieu diem chung chi khi chung la hai tia trung nhaue/Hai tia phan biet va co chung goc luon la hai tia doi nhauf/Hai tia ko chung goc luon la hai tia khong co diem chung3/a/Ve 3 diem thang...
Đọc tiếp
1.Tim cac so tu nhien x sao cho:
a/6 chia het cho (x-1) b/14 chia het cho (2.x+3)
2.Ve hinh de thay rang moi cau sau day la sai
a/Hai tia chung goc luon la hai tia doi nhau
b/Hai tia chung goc luon la hai tia trung nhau
c/Hai tia chung hoc luon la hai tia phan biet
d/Hai tia co nhieu diem chung chi khi chung la hai tia trung nhau
e/Hai tia phan biet va co chung goc luon la hai tia doi nhau
f/Hai tia ko chung goc luon la hai tia khong co diem chung
3/
a/Ve 3 diem thang hang A,B,C sao cho diem B nam giua hai diem A,C.Sau do hay ke ten:cac tia,cac cap tia doi nhau,cac cap tia phan biet,cac cap tia trung nhau co trong hinh ve do.
b/Ve 4 diem A,B,C,D tren mot duong thang sao cho diem B nam giua hai diem A,C va diem C nam giua hai diem B,D.Sau do hay ke ten:cac tia,cac cap tia doi nhau,cac cap tia phan biet,cac cap tia trung nhau co trong hinh ve do.
~~~~~~~~~~~~~Giup tui voi!!!!!~~~~~~~~~~~~~~
Bai 1 : Tim x :
a ) 25% .x + x = -1,25
Bai 2 : Cho 2 goc ke bu xOy va yOz , biet xOy = 60 do
a ) Tinh so do goc yOz .
b ) Goi Om la tia phan giac cua goc yOz . Chung to Oy la tia phan giac cua goc xOm .
Ai lam nhanh va dung mk se tick cho nha .
Tim x la phan tu cua N biet
a ) ( x - 5 ) x 4 = 36
b) ( 48 - x ) x 2 = 14
c) ( 2 x X - 3 ) x 5 = 4
d) 1 + 3 + 5 +..........+ X = 36
e) 1 + 2 + 3 + ...........+ X = 55 + 6 +.....+ 2X = 110
1.Cho so N la so co hai chu so chia het cho 3.Neu viet xen so 0 vao giua hai chu so do roi cong no voi hai lan chu so hang chuc cua so N ta duoc so moi gap 9 lan so N.Tim so do
2.Tong hai so thap phan la 60,1.Neu dich dau phay cua so nho sang ben phai mot hang roi dem tru di so lon thi ta duoc 219,52.Tim hai so do.
3.Tim so co hai chu so biet neu ta them so 33 vao giua hai chu so do thi duoc mot so moi gap so phai tim 89 lan.
tren nua mat phang cho n diem phan biet, trong do co dung 3 diem thang hang. Qua 2 diem ta ve mot doan thang. biet so doan thang la 171. Tim n
Bai1 : -5 phan 2 -7x=x-4 phan 3
bai 2: Mot ba no mang mot ro trung ra ban . Sau khi ban mot hoi lau ba kiem tra tay rang neu ba ban them duoc 2 qua nua thi ba se ban duoc 4 phan 5 so trung luc dau. Tim so trung trong ro luc dau biet so trung con lai la 13 qua
CAC BAN GIUP MKNH NHA! MINH SE KET BAN
Tim x biet
- 2 :( x + 1 ) la mot so nguyen