[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)=?
( 100 x 0,1 - 900 x 0,1 -90 x 0,1 ) x (142 x 0,5 - 240 x 0,25 )
=(10 - 90 - 9 ) x ( 71 - 60 )
= -89 x 11
= -979
tính nhanh:
1/90:0.25+1/90:0.2+1/90:0.5+1/90:0.125-1/90:0.1
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!
x/0.5+x/0.25+x/0.1=16
150 - 40 × 20 × 5 × 0.5 × 0.25 × 0.2 - 5 - 0.1
Tính nhanh : (792.81* 0.25+ 792.81 * 0.75) * (11*9-900*0.1-9)
=792.81*(0.25+0.75)*9*(11+10-1)
=792.81*9*20
co ban nao biet giai bai nay ko
0.*9*50+9*3.2+90*0.28
neu giai duoc minh cho
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 - 1 + 1 - 1
= 0 + 0
= 0
\(\frac{1}{2}:0,5-\frac{1}{4}:0,25+\frac{1}{8}:0,125-\frac{1}{10}:0,1\)
\(=\frac{1}{2}:\frac{1}{2}-\frac{1}{4}:\frac{1}{4}+\frac{1}{8}:\frac{1}{8}-\frac{1}{10}:\frac{1}{10}\)
\(=1-1+1-1=0\)
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
=1-1+1-1
=0