tính nhanh :
50 x 10 + 50 x 10
10 x 20 + 80 x 10
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=(250-50)- (0,95x40)x(10x0,1)x(0,125x80)
=200 - (38 x1x10)
=200-380
=-180
= ( 60 + 50+40+30+20+10 ) x 2000 + 1500
= 210 x 2000 + 1500
= 420000 + 1500
= 421500
20 + 60 + 50 + 80 + 90 + 10 + 50 + 60 x 10
= (20 + 80) + (50 + 50 ) + (90 + 10 ) + 600 + 60
= 100 + 100 + 100 + 660
= 960
=(20+80)+(50+50)+(90+10)+(60*10)+60
=100+100+100+600+60
=960
50 + 50 + 50 + 50 x 10 x 10 + 10
= (50 + 50) + 50 x 10 x 10 + 10
= 100 + 500 x 10 + 10
= 100 + 5000 + 10
= 5110
\(\frac{x+10}{90}+\frac{x+20}{80}+\frac{x+30}{70}+\frac{x+40}{60}+\frac{x+50}{50}=-5\)
<=> \(\frac{x+10}{90}+1+\frac{x+20}{80}+1+\frac{x+30}{70}+1+\frac{x+40}{60}+1+\frac{x+50}{50}+1=0\)
<=> \(\frac{x+100}{90}+\frac{x+100}{80}+\frac{x+100}{70}+\frac{x+100}{60}+\frac{x+100}{50}=0\)
<=> \(\left(x+100\right)\left(\frac{1}{90}+\frac{1}{80}+\frac{1}{70}+\frac{1}{60}+\frac{1}{50}\right)=0\)
<=> x + 100 = 0
<=> x = -100
Vậy x = -100
50 x 2 + 8 x 50
= (2 + 8) x 50
= 10 x 50
= 500
10 + 10 + 10 + 50 + 50 + 10 + 10
= (10 x 5) + (50 + 50)
= 50 + 100
= 150
50 x 2 + 8 x 50
= 50 x ( 2 + 8 )
= 50 x 10
= 500
10 + 10 + 10 + 50 + 50 + 10 + 10
= 10 x 5 + 50 x 5
= 50 + 250
= 300
50 x 10 + 50 x 10
= (50 + 50) x 10
= 100 x 10
= 1000
10 x 20 + 80 x 10
= (20 + 80) x 10
= 100 x 10
= 1000
\(50.10+50.10\)
\(=500+500\)
\(=1000\)
\(10.20+80.10\)
\(=10.\left(20+80\right)\)
\(=10.100\)
\(=1000\)