tính
0,5. 4/3.25% : 2/5 + 3/5
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= 3.25 - 5 . [43 - (27 - 25) : 1]
= 75 - 5 . [64 - 2]
= 75 - 5 . 62
= 75 - 310
= - 245
a) \(\dfrac{-4}{6}\)
b) \(\dfrac{1}{3}\)-\(\dfrac{20}{60}\)
= 0
c) \(-20^2\)+(\(-50^3\))
= -400 + (-125000)
=-125400
d) \(\dfrac{-2}{7}\)+\(\dfrac{15}{35}\)
= \(\dfrac{-10}{35}\)+\(\dfrac{15}{35}\)
= \(\dfrac{5}{35}\)=\(\dfrac{1}{7}\)
\(a,5\frac{1}{4}+3,25-50\%+y=15,25\)
\(\Leftrightarrow5,25+3,25-\frac{50}{100}+y=15,25\)
\(\Leftrightarrow5,25+3,25-0,5+y=15,25\)
\(\Leftrightarrow8+y=15,25\)
\(\Leftrightarrow y=15,25-8=7,25\)
\(b,(y-3):2=2010\)
\(\Leftrightarrow y-3=4020\)
\(\Leftrightarrow y=4023\)
a,
11+6+(-11)+(-3)
= [11+(-11)]+(6+(-3)]
=0+3
=3
b,
25.7.(-5).(-4).2
=[25.(-4)].[-5.(-2)].7
=-100.10.7
-7000
c,
3.25-7.(-25)
=3.25+7.25
=(3+7).25
=10.250
=250
( 29,38 - 3,25 x 5 +36,36 : 3 ) : 6,25
= 25,25 : 6,25
= 4,04
\(0,5.\frac{4}{3}.25\%:\frac{2}{5}+\frac{3}{5}\)
\(=\frac{1}{2}.\frac{4}{3}.\frac{1}{4}.\frac{5}{2}+\frac{3}{5}\)
\(=\frac{5}{12}+\frac{3}{5}\)
\(=\frac{25}{60}+\frac{36}{60}\)
\(=\frac{71}{60}\)
0,5.4/3.25%:2/5+3/5
= 1/2.4/3.1/4:2/5+3/5
= 2/3.1/4.5/2+3/5
= 1/6.5/2+3/5
= 5/12+3/5
= 25/60+36/60
= 61/60