giam so A di 20% thi duoc so B . hoi phai giam so B di bao nhieu phan tram cua no de ta duoc so moi bang 20% so A ?
GIAI CO LIKE NHA AI GIAI DAY U DE HIEU DUNG MINH LIKE CHO
MINH NGOC LAM NEN GIAI DE HIEU NHA
Cho phan so a/b co gia tri bang 3/4 neu giam mau so di 12 don vi va giu nguyen tu so thi duoc phan so moi co gia tri bang 6/7 tim gia tri cua phan so a/b
cho a/b bang 4/5 neu cong them 33 vao tu so va giu nguyen mau son thi duoc phan so moi la 25/41
ai nhanh minh tick
minh can gap chieu nay nop roi xin cac ban giup minh
Khi chuyen dau phay cua so thap phan A sang ben trai hai chu so thi so do giam di 100 lan hay A=B*100
bai 2 1 so sau khi giam di 20/100 thi phai tang them ...phan tram so moi de lai duoc so cu
gia 1 cai ao so mi la 90000 dong sau hai lan giam gia moi lan giam 10 phan tram so voi gia ban dau thi gia ban ao so mi do la bao nhieu
dung ghi D sai ghi S chon dap an dung nhat
a)mot so neu giam 6 lan roi them 25,71 thi duoc 88,5; 37674 685,26
b)mot so neu bot 1, 38 roi giam 10 lan thi duoc 15,05 .so do la
149,12 151,88
Neu canh hinh lap phuong giam 10 phan tram thi dien tich toan phan giam bn phan tram
giai ra ho monh nhe ai nhanh minh tick cho
1,tim mot so co hai chu so,biet rang so do lon gap ba lan tich cac chu so cua no
2,cho so co ba chu so,neu ta xoa chu so hang tram thi so do giam 5 lan.tim so do
giup mink voi nha moi nguoi,toi nay minh can gap
viet cac phan so thap phan sau duoi dang thap phan
a 1/10 1/100 1/1000 1/10000
b 84/10 225/100 6453/1000 25789/10000