160x5-25x4) :7-3*x=36*25:9-60
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Lời giải:
$(160\times 5-25\times 4):7-3\times x=36\times 25:9-60$
$(800-100):7-3\times x=(36:9)\times 25-60$
$700:7-3\times x=4\times 25-60$
$100-3\times x=100-60$
$100-3\times x=40$
$3\times x=100-40=60$
$x=60:3=20$
(160×5−25×4):7−3×x=36×25:9−60(160×5−25×4):7−3×�=36×25:9−60
(800−100):7−3×x=(36:9)×25−60(800−100):7−3×�=(36:9)×25−60
700:7−3×x=4×25−60700:7−3×�=4×25−60
100−3×x=100−60100−3×�=100−60
100−3×x=40100−3×�=40
3×x=100−40=603×�=100−40=60
x=60:3=20
(160*5-25*4):7-3xX=40
97xX=40
X=97:40
X=2.245
mong bạn đánh giá kq của mình ^^
( 160 \(\times\) 5 - 25 \(\times\) 4 ) \(\div\) 7 - 3 \(\times\) \(x\) = 36 \(\times\) 25 \(\div\) 9 - 60
( 800 -100) \(\div\) 7 - 3 \(\times\) \(x\) = 900 \(\div\) 9 - 60
700 \(\div\) 7 - 3 \(\times\) \(x\) = 100 -60
100 - 3 \(\times\) \(x\) = 40
3 \(\times\) \(x\) = 100 - 40
3 \(\times\) \(x\) = 60
\(x\) = 60 \(\div\) 3
\(x\) = 20
a.
12054: ( 15 + 67 )
= 12054 : 82
= 147
29150-136x201
=29150-27336
=1814
b) 9700:100+36x12
=97+432
=529
(160x5-25x4):4
=(800-100):4
= 700:4
=175
k mink nhé
\(B=\frac{36}{1.3.5}+\frac{36}{3.5.7}+\frac{36}{5.7.9}+...+\frac{36}{25.27.29}\)
\(=9.\left(\frac{4}{1.3.5}+\frac{4}{3.5.7}+\frac{4}{5.7.9}+...+\frac{4}{25.27.29}\right)\)
\(=9.\left(\frac{1}{1.3}-\frac{1}{3.5}+\frac{1}{3.5}-\frac{1}{5.7}+\frac{1}{5.7}-\frac{1}{7.9}+...+\frac{1}{25.27}-\frac{1}{27.29}\right)\)
\(=9.\left(\frac{1}{3}-\frac{1}{675}\right)\)
\(=9.\frac{224}{675}\)
\(=\frac{224}{75}\)
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
a;
c; \(\dfrac{1}{10}\) + \(\dfrac{4}{20}\) + \(\dfrac{9}{30}\)+\(\dfrac{16}{40}+\dfrac{25}{50}+\dfrac{36}{60}+\dfrac{49}{70}+\dfrac{64}{80}+\dfrac{81}{90}\)
= \(\dfrac{1}{10}+\dfrac{2}{10}+\dfrac{3}{10}+\dfrac{4}{10}+\dfrac{5}{10}+\dfrac{6}{10}+\dfrac{7}{10}+\dfrac{8}{10}+\dfrac{9}{10}\)
= \(\dfrac{1+2+3+4+5+6+7+8+9}{10}\)
= \(\dfrac{\left(1+9\right)+\left(2+8\right)+\left(3+7\right)+\left(4+6\right)+5}{10}\)
= \(\dfrac{10+10+10+10+5}{10}\)
= \(\dfrac{\left(10+10+10+10\right)+5}{10}\)
= \(\dfrac{10\times4+5}{10}\)
= \(\dfrac{45}{10}\)
= \(\dfrac{9}{2}\)
Bạn ghi lại đề đi bạn