1/90:0.25+1/90:0.5+1/90:0.125-1/90:0.1
= 1/90 x 4 + 1/90 x 5 + 1/90 x 2 + 1/90 x 8 - 1/90 x 10
= 1/90 x ( 4+5+2+8-10)
= 1/90 x 9
= 1/10
k nha!Cảm ơn nhiều!
[1000*0.1-900*0.1-90*0.1]*[142*0.5-240*0.25]
(100*0.1-900*0.1-90*0.1)*(142*0.5-240*0.25)=?
tính nhanh
1/2:0.5-1/4|:0.25+1/8:0.125-1/10:0.1
Tính nhanh 1/90:0,25 +1/90:0,2 +1/90 :0,5 +1/90:0,125-1/90 :0,1
tinh nhanh
1/2/0.5-1/4/0.25+1/8/0.125-1/10/0.1
1/2:0.5-1/4:0.25+1/8:0.125-1/10:0.1
1/2 : 0.5 - 1/4 : 0.25 + 1/8 : 0.125 - 1/10 : 0.1
1/2:0.5-1/4:0.25+1/8:0.125-1/10:0.1
1/2:0.5-1/4:0.25+1/8:0.125-1/10:0.1