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a) 200 + 300 x 2 - 100 + ( -100)
= 200 + 600 - 100 + ( -100 )
= 800 - 100 + ( -100 )
= 700 + ( -100 )
= 600
b) 500 - 100 x 3 + ( -13 )
= 500 - 300 + ( -13 )
= 200 + ( -13 )
= 187
a ) 200 + 300 x 2 - 100 + ( - 100 )
= 200 + 600 - 100 + ( - 100 )
= 800 - 100 + ( - 100 )
= 700 + ( - 100 )
= 600
b ) 500 - 100 x 3 + ( - 13 )
= 500 - 300 + ( - 13 )
= 200 + ( - 13 )
= 187
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300 + 400 x 2 + 100
= 300 + 800 + 100
= 1100 + 100
= 1200
300 + 400 x 2 + 100
= 300 + 800 + 100
= 1100 + 100
= 1200
tk mk nha
hihi <3
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1)
a) (a-b) - (c-b) - a= a - b - c + b - a = -c
b) -(300 - 400) + (300 - 400) + 100 = 100
2) a) 4x - 20 = 50 - ( 30 -3x)
4x - 20 = 50 - 30 + 3x
4x - 3x = 50 - 30 + 20= 40
x = 40
b) 100 - (-5x) = 40 - (-4x +10)
100 + 5x = 40 + 4x -10
5x - 4x = 40 - 10 -100
x = -70
c) (-50) + (-7x) = 100 - 8x
-7x + 8x = 100 + 50
x = 150
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\(\frac{1}{10}+\frac{20}{100}+\frac{300}{1000}+\frac{40000}{100000}\)
\(=\frac{1}{10}+\frac{20}{10}+\frac{30}{10}+\frac{40}{10}\)
\(=\frac{1+2+3+4}{10}\)
\(=\frac{10}{10}\)
\(=1\)
1/10 + 20/100 + 300/1000 + 4000/10000
=1/10 + 2/10 + 3/10 + 4/10
=10/10
=1
= 190 - 300
= - 110
90 + 100 - 300
= 190 - 300
= -110