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Bài 1:
a, 58.32 + 58.68 - 800
= 58.(32 + 68) - 800
= 58.100 - 800
= 5800 - 800
= 5000
b, 12020 + 280 : [55 - (7 - 4)3]
= 12020 + 280 : [ 55 - 33 ]
= 12020 + 280 : [ 28]
= 12020 + 10
= 12030
c, (96 - 19 - 45) - (55 + 96 - 119)
= 96 - 19 - 45 - 55 - 96 + 119
= (96 - 96) + (119 - 19) - (45 + 55)
= 0 + 100 - 100
= 0
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7,1 + (-5,25)-(-2,25+7,1)
= 7,1 + ( -5,25 ) + 2,25 + 7,1
= 7,1 + (-3) + 7,1
= 11,2
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\(2x+25\%x=-2,25\)
\(\Leftrightarrow2x+\frac{25}{100}x=-\frac{225}{100}\)
\(\Leftrightarrow2x+\frac{1}{4}x=-\frac{9}{4}\)
\(\Leftrightarrow x\left(2+\frac{1}{4}\right)=-\frac{9}{4}\)
\(\Leftrightarrow\frac{9}{4}x=-\frac{9}{4}\)
\(\Leftrightarrow x=-\frac{9}{4}\div\frac{9}{4}\)
\(\Leftrightarrow x=-1\)
\(5,432.5,39-4,63:2,25+11,6=29,27848-\dfrac{463}{225}+11,6=382070222\)