19/37 - (19/37 -15/37) 7429 -(3125+429). Tính bằng cách thuận tiện
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a,7429-(3125+429)
=7429-3125-429
=(7429-429)-3125
=7000-3125
=3875
b,\(\frac{19}{37}+\left(1-\frac{19}{37}\right)\)
=\(\frac{19}{37}+1-\frac{19}{37}\)
=\(\frac{19}{37}-\frac{19}{37}+1\)
=\(0+1\)
=\(1\)
a) 7429-(3125+429)=7429-3125-429=7429-429-3125=7000-3125=3875
b) 19/37+(1-19/37)=(19/37-19/37)+1=0+1=1
a,7429-(3125+4297)
=7407-93103+4297)
=7407-7400
7
b,9/8-(17/7-3/7)+7/8
=(9/8 +7/8)-(17/7-3/7)
=2-2
=0
c,tự làm nhé..
a) Ta có:
\(\frac{19}{15}\)= 1+ \(\frac{4}{15}\).
\(\frac{15}{11}\)= 1+ \(\frac{4}{11}\).
Vì \(\frac{4}{15}\)< \(\frac{4}{11}\).
=> 1+ \(\frac{4}{15}\)< 1+ \(\frac{4}{11}\).
=> \(\frac{19}{15}\)< \(\frac{15}{11}\).
a) 19/37 + (1 - 19/37)
= (19/37 - 19/37) + 1
= 0 + 1 = 1
b) 15,27 - 4,13 - 1,14
= 15,27 - ( 4,13 + 1,14)
= 15,27 - 5,27
= 10
c) 60 - 13,75 - 26,25
= 60 - ( 13,75 + 26,25)
= 60 - 40
= 20
19/37+1-19/37
=(19/37-19/37)+1
=0+1
=1
9/8-(17/7-3/7)+7/8
=(9/8+7/8)-(17/7-3/7)
=2-2
=0
1/2+3/4+1/2
=(1/2+1/2)+3/4
=1+3/4
=7/4
\(\frac{1919}{2323}.\frac{4646}{7474}.\frac{37}{19}\)
\(=\frac{19}{23}.\frac{23}{37}.\frac{37}{19}\)
\(=\frac{19.23.37}{23.37.19}\)
\(=1\)
_Chúc bạn học tốt_
ta có:
\(\frac{1919}{2323}=\frac{19}{23}\)
\(\frac{4646}{7474}=\frac{46}{74}\)
=> \(\frac{1919}{2323}\cdot\frac{4646}{7474}.\frac{37}{19}=\frac{19}{23}\cdot\frac{46}{74}\cdot\frac{37}{19}\)= \(\frac{19}{23}\cdot\frac{2\cdot23}{37\cdot2}\cdot\frac{37}{19}\)= 1
=19\37-(19\37-15\37)
=19\37-19\37+15\37
=(19\37-19\37)+15\37
=15\37