57.72:3.7*4.2-38.16
(17.04+9.06):7.25
Những câu hỏi liên quan
a) 6.3+(-3.7)+2.4+(-0.3)
b)(-4.9)+5.5+4.9+(-5.5)
c)2.9 +3.7+(-4.2)+(-2.9)+4.2
d)(-6.5).2.8+2.8.(-3.5)
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height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300">
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a) 6.3+(-3.7)+2.4+(-0.3)
b)(-4.9)+5.5+4.9+(-5.5)
c)2.9 +3.7+(-4.2)+(-2.9)+4.2
d)(-6.5).2.8+2.8.(-3.5)
a) 6,3 + (-3,7) + 2,4 + (-0,3)
= (6,3 + 2,4) + [-3,7 + (-0,3)]
= 8,7 + (-4)
= 4,7
b) (-4,9) + 5,5 + 4,9 + (-5,5)
= (-4,9 + 4,9) + [5,5 + (-5,5)]
= 0 + 0
= 0
c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2
= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7
= 0 + 0 + 3,7
= 3,7
d) (-6,5) . 2,8 + 2,8 . (-3,5)
= 2,8 . [-6,5 + (-3,5)]
= 2,8 . (-10)
= -28.
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Cho 2 phân số
\(\dfrac{a}{b}\)=\(\dfrac{3^4.2^3-3^4.4}{3^5.3^2-3^5.5}\)
\(\dfrac{c}{d}\)=\(\dfrac{5^3.7-5^2.2}{5^3.7-5^3.4}\)
Rút gọn và so sánh
phân số thứ 2 ở trên tử số\(5^3\) thành \(5^2\) nha
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\(\dfrac{a}{b}=\dfrac{3^4\cdot2^2\cdot\left(2-1\right)}{3^5\cdot\left(3^2-5\right)}=\dfrac{2^2}{3}\cdot\dfrac{1}{4}=\dfrac{1}{3}\)
\(\dfrac{c}{d}=\dfrac{5^3\left(7-2\right)}{5^3\left(7-4\right)}=\dfrac{5}{3}\)
Do đó: a/b<c/d
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Rút gọn: 7 . 25 - 49 7 . 24 + 21
1.257*26.5+12.57*7.25+1.257
\(1,257\times26,5+12,57\times7,25+1,257\\ =12,57\times2,65+12,57\times7,25+12,57\times0,1\\ =12,57\times\left(2,65+7,25+0,1\right)\\ =12,57\times10=125,7\)
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3.7*3.8+8.3*3.7-0.4*3.7*5
3.7x3.8+8.3x3.7-0.4x3.7x5=1523.142
cho mình nha
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3.7*3.8+8.3*3.7-0.4*3.7*5
=3,7*(3,8+8,3-0,4*5) = 3,7*10,1=37,37
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4.6X+(-6.6)X+5.15=7.25
4.6x+(-6.6)x+5.15=7.25
24x-36x+75=175
-12x=100
x=-25/3
tick mình nha
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7.25-3/8x=50%