1.tinh :
a]13,5% +68% = b] 95,4% - 12,37% = c] 13,5% x3 = d]90% : 5
2.tim y :
a] y+y x25% = 2,5 b) y : 0,25+y x 11 = 24
3 mot to tho moc dat ke hoach.Tuan nay phai lam duoc 180 bo ban ghe .Do co co gang to do da lam duoc 207 bo ban ghe .hoi:
a) To do dat duoc bao nhieu % ke hoach?
b) to do vuot muc bao nhieu % ke hoach?
4. mot nguoi bo ra 650.000 dong ( tien von) de ma banh keo .Sau khi ban het so banh keo thi thuduoc 728.000 dong. Hoi :
a) so tien ban bang bao nhie % so tien von ?
b) nguoi do duoc lai bao nhieu % ?