so sánh E= 1632 + 74x163+372 và F= 1472-94.147+472
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A = 4 + 3 7 + 4 7 2 + − 9 7 4 + 27 7 5 + 1 7 6 = 4 + 3 7 + 4 7 2 + 27 7 5 + − 9 7 4 + 1 7 6
B = 3 7 + 4 + 5 7 6 + 4 7 2 + 27 7 5 + − 9 7 9 = 4 + 3 7 + 4 7 2 + 27 7 5 + 5 7 6 + − 9 7 9
D o − 9 7 4 + 1 7 6 < 5 7 6 + − 9 7 9 ⇒ A < B
A = 4 + 3 7 + 4 7 2 + − 9 7 4 + 27 7 5 + 1 7 6 = 4 + 3 7 + 4 7 2 + 27 7 5 + − 9 7 4 + 1 7 6
B = 3 7 + 4 + 5 7 6 + 4 7 2 + 27 7 5 + − 9 7 9 = 4 + 3 7 + 4 7 2 + 27 7 5 + 5 7 6 + − 9 7 9
D o − 9 7 4 + 1 7 6 < 5 7 6 + − 9 7 9 = > A < B
\(A=163^2+74.163+37^2\)
\(=163^2+2.37.163+37^2\)
\(=\left(163+37\right)^2=200^2\)
\(B=147^2-94.147+47^2\)
\(=147^2-2.47.147+47^2\)
\(=\left(147-47\right)^2=100^2\)
Vậy A > B
Lời giải:
a. $=(36+76)-89-(44+56)$
$=112-89-100=12-89=-(89-12)=-77$
b. $=342-567-642+767-458$
$=(342-642)+(767-567)-458=-300+200-458=-100-458=-(100+458)=-558$
c. $=1892-892+852-300-852$
$=(1892-892)+(852-852)-300=1000+0-300=700$
d.
$=472-281-513-372+181-487$
$=(472-372)-(281-181)-(513+487)$
$=100-100-1000=-1000$
e.
$=912-1268-812+1368-100$
$=(912-812)+(1368-1268)-100=100+100-100=100$
a. \(\frac{26}{42}< \frac{56}{78}\)
b.\(\frac{58}{89}< \frac{36}{53}\)
c.\(\frac{1530}{1632}>\frac{1414}{1515}\)
d.\(\frac{-373737}{515151}>\frac{-1111}{1212}\)
k cho mk nha!!!!
a) \(x\times x+372=472\)
\(x^2=100\)
\(x=10;-10\)
b) \(69,5-x\times x=20,5\)
\(69,5-x^2=20,5\)
\(-x^2+69,5=20,5\)
\(-x^2=-49\)
\(x^2=49\)
\(x=-7;7\)
c) \(x\times x-\dfrac{1}{6}=\dfrac{5}{18}\)
\(x^2=\dfrac{4}{9}\)
\(x=\dfrac{2}{3};-\dfrac{2}{3}\)
\(E=163^2+74\times163+37^2=163^2+2\times163\times37+37^2=\left(163+37\right)^2=200^2\)
\(F=147^2-94\times147+47^2=147^2-2\times147\times47+47^2=\left(147-47\right)^2=100^2\)
\(\frac{E}{F}=\frac{200^2}{100^2}=\left(\frac{200}{100}\right)^2=2^2=4\)
\(E=4F\)