Tính:
a) $\frac{23}{25}$ -0,92= $\frac{23}{25}$ - $\frac{92}{100}$ = $\frac{23}{25}$ - $\frac{23}{25}$ = 0
b) 1,956-4,5= $\frac{1956}{1000}$ - $\frac{45}{10}$ = $\frac{1956}{1000}$ - $\frac{4500}{1000}$ = -$\frac{2,544}{1000}$ = - 2,544
c) 3,15-7,4= $\frac{315}{100}$ - $\frac{74}{10}$ = $\frac{315}{100}$ - $\frac{740}{100}$ = -$\frac{425}{100}$ = -4,25
d) 0,68-1,2=$\frac{68}{100}$ - $\frac{12}{10}$ = $\frac{68}{100}$ - $\frac{120}{100}$ = -$\frac{52}{100}$ = -0,52
@hoangvan2008
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