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(900-45)x45+(800+55)x55
=855x45+855x55
=855x(45+55)
=855x100
=85500
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\(a)\left(80\times96+40\times1808\right):1000\)
\(=\left(80\times96+40\times2\times904\right):1000\)
\(=\left(80\times96+80\times904\right):1000\)
\(=80\times\left(96+904\right):1000\)
\(=80\times1000:1000\)
\(=80\)
\(b)\) em xem lại đề xem có sai gì không em.
\(c)10\times12\times14\times16\times\left(88\times17-44\times34\right)\)
\(=10\times12\times14\times16\times\left(44\times2\times17-44\times2\times17\right)\)
\(=10\times12\times14\times16\times0\)
\(=0\)
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4a) \(\frac{x}{36}=\frac{3}{4}\)
\(\Rightarrow\frac{x}{36}=\frac{27}{36}\)
\(\Rightarrow x=27\)
4b) 33 + x = 71 - 26
33 + x = 45
x = 45 - 33
x = 12
4c) x * (3,5 + 1,5) = 10
x * 5 = 10
x = 10 ; 5 = 2
4,
\(a,\frac{x}{36}=\frac{24}{32}\)
\(=>\frac{x}{36}=\frac{3}{4}=\frac{27}{36}\)
\(=>x=27\)
\(b,71-\left(33+x\right)=26\)
\(=>-\left(33+x\right)=26-71=-45\)
\(=>33+x=45\)
\(=>x=12\)
\(c,3,5\cdot x+1,5\cdot x=10\)
\(>x\cdot\left(3,5+1,5\right)=10\)
\(=>x\cdot5=10\)
\(=>x=2\)
. là nhân nha
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tất cả đều đặt nhân tử chung bạn ạ
a, 399 x45 + 55x 399 = 399 x (45+55) = 399x 100
1995 x 1996 - 1991x1995= 1995x (1996-1991)=1995 x 5 = 2000 -5= (400 x5) - 1 x 5= 5x (400-1) = 5*399
nên đáp án là bằng 100/5 = 20
hai câu sau làm tương tự , ahihi
theo mình Nguyễn Như Quỳnh làm sai rồi
399 x 45 + 55 x 399 / 1995 x 1996 - 1991 x 1995 = 399 x (45+55) / 1995 x (1996-1991)=399 x 100 / 1995 x 5=399 x 100/ 399x5x5=399x100/399x25=100/25=4
các bạn thấy mình đúng thì k cho mình nha !
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\(0,25+25\%\times55+\dfrac{1}{4}\times45-\dfrac{2}{8}\)
\(=\dfrac{1}{4}+\dfrac{1}{4}\times55+\dfrac{1}{4}\times45-\dfrac{1}{4}\)
\(=\dfrac{1}{4}\times\left(1+55+45-1\right)\)
\(=\dfrac{1}{4}\times100\)
\(=25\)
\(0,25+25\%\times55+\dfrac{1}{4}\times45-\dfrac{2}{8}\)
\(=\dfrac{1}{4}+\dfrac{1}{4}\times55+\dfrac{1}{4}\times45-\dfrac{1}{4}\)
\(=\dfrac{1}{4}\times1+\dfrac{1}{4}\times55+\dfrac{1}{4}\times45-\dfrac{1}{4}\times1\)
\(=\dfrac{1}{4}+\left(1+55+45-1\right)\)
\(=\dfrac{1}{4}\times100\)
\(=0,25\times100\)
\(=25\)
\(#:)\)
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45,6 x 45 + 45,6 x 10 + 55 x 45,6
= 45,6 x ( 45 + 10 + 55)
= 45,6 x 110
= 5016
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(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200 – 1808 x 25)
=(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200-45200)
=(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x 0
=0
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45 x ( 55 + 117 ) + 55 x ( 117 - 45 )
= (45 x 55 - 45 x 55) + (45 + 55) x 117
= 0 + 100 x 117 = 11700
\(45\times\left(55+117\right)+55\times\left(117-45\right)\)
\(=45\times55+45\times117+55\times117-55\times45\)
\(=\left(45\times55-45\times55\right)+45\times117+55\times117\)
\(=45\times117+55\times117\)
\(=117\times\left(45+55\right)\)
\(=117\times100\)
\(=11700\)
24 x 55 + 45 x 10 + 45 x 14 + 1400
= 24 x 55 + 45 x ( 10 + 14 ) + 1400
= 24 x 55 + 45 x 24 + 1400
= 24 x ( 55 + 45 ) + 1400
= 24 x 100 + 1400
= 2400 + 1400
= 3800
\(24\times55+45\times10+45\times14+1400\\ =24\times55+45\times\left(10+14\right)+1400\\ =24\times55+45\times24+1400\\ =24\times\left(55+45\right)+1400\\ =24\times100+1400\\ =2400+1400\\ =3800\)