... 9,2 4, 8 37,86- 37,86-(9,2+ b,c,d, l m bi giỏn tip 9, 24, 8)=23,86 4, 8=2 H4 theo lụ gụ sỏch hng dn hc 3,86 Cỏ nhõn lm bi vo v b,c1 9 ,4- 2 ,5 -4, 7=2,2 23 ,58 -(6,38+12 ,4) c2 9 ,4- (2 ,5 +4, 7)=2,2 =23 ,58 -18,78 =4, 8 ... 23 ,58 -(6,38+12 ,4) c2 9 ,4- (2 ,5 +4, 7)=2,2 =23 ,58 -18,78 =4, 8 23 ,58 -6,38-12 ,4= 4, 8 H6 Bi gii Qu th hai cõn nng l; 5, 9-1 ,5= 4, 4 (kg) Qu th ba cõn nng l: 13 ,5 5, 9 -4, 4 =3,2(kg) ỏp s:3,2 kg 16 O C Tit LUYN TING ... dn hc B.HOT NG THC HNH Theo lụ gụ sỏch hng dn hc 2 34 x 18 = 18x 2 34 14 x ( 25 x 7) = ( 14 x 25) x7 ( 45 X27) x 342 = 45 x (27 x 342 ) Tit2 KHOA HC BI 13 S CHUYN TH CA NC(T 1) I.Mc tiờu (sỏch hng...