a. 547 + 389 + 453 + 211
b. 158 + 445 + 342 + 555
c. 24 x 3 x 5 x 10
d. 12 x 5 x 15 x 7
e. 1122 x 34 + 2244 x 83
f. 8466 x 15 + 170 x 4233
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a,(x-15)-75=0
x-15 =75
x =75+15
x =90
b,72-(6.x+5)=55
6.x+5=72-55
6.x+5=17
6.x=17-5
6.x=12
x=12:6
x=2
c,575-(6.x+70)=445
6.x+70=575-445
6.x+70=130
6.x=130-70
6.x=60
x=60:6
x=10
d,(x-34).15=0
x-34=0
x=34
e,15+(18-x)=26
18-x=26-15
18-x=11
x=18-11
x=7
g,(x-5):16=2
x-5=2.16
x-5=32
x=32+5
x=37
Bài toán 1: Tính.
a) (-34) + (-91) + (-26) + (-99)
= [(-34) + (-26)] + [(-91) + (-99)]
= -60 + (-190)
= -250
b) 125 + |-25|
= 125 + 25
= 150
c) |-26| + |-34|
= 26 + 34
= 60
d) |-82| + (-120)
= -82 + (-120)
= -202
e) (-275) + |-115|
= -275 + 115
= -160
f) (-34) + |-34|
= (-34) + 34
= 0
mình cũng hỏi về cái này gấp nha ai biết trả lời câu nào thì trả
(x-15) - (x-3) = -(x+17) - 1 <=> x-15-x+3 = -x-17-1 <=> x = -6
-(x-12) - (x-5) = -(4-x) + 13 <=> -x+12-x+5 = -4+x+13 <=> -3x = -8 => x = 8/3
34 - (x-7) = x+15 - (x+23) <=> 34-x+7 = x+15-x-23 <=> -x = -49 <=> x = 49
b. \(\dfrac{4.2.3.5.2.6.2.5.3}{4.3.4.5.6.4.5.6}=\dfrac{1}{4}\)
c. \(\dfrac{17.2.101.2005}{17.2.101.2.2005}=\dfrac{1}{2}\)
d. \(\dfrac{2.3.4.2.11.13.17}{3.11.4.4.17.13.2}=\dfrac{1}{2}\)
a)\(\dfrac{4\times6\times10\times12\times15}{4\times12\times5\times24\times30}=\dfrac{2}{2\times2\times2}=\dfrac{2}{8}=\dfrac{1}{4}\)
b)\(\dfrac{34\times101\times2005}{17\times202\times4010}=\dfrac{2}{2\times2}=\dfrac{2}{4}=\dfrac{1}{2}\)
c)\(\dfrac{6\times8\times11\times13\times17}{33\times16\times17\times26}=\dfrac{6}{3\times2\times2}=\dfrac{1}{2}\)
a) \(547+389+453+211\)
\(=\left(547+453\right)+\left(389+211\right)\)
\(=1000+600\)
\(=1600\)
b) \(158+445+342+555\)
\(=\left(158+342\right)+\left(445+555\right)\)
\(=500+1000\)
\(=1500\)
c) \(24.3.5.10\)
\(=\left(24.5\right).\left(10.3\right)\)
\(=120.30\)
\(=3600\)
d) \(12.5.15.7\)
\(=\left(12.5\right).\left(15.7\right)\)
\(=60.105\)
\(=6300\)
e) \(1122.34+2244.83\)
\(=1122.2.17+2244.83\)
\(=2244.17+2244.83\)
\(=2244.\left(17+83\right)\)
\(=2244.100\)
\(=224400\)
f) \(8466.15+170.4233\)
\(=8466.15+85.2.4233\)
\(=8466.15+85.8466\)
\(=8466.\left(15+85\right)\)
\(=8466.100\)
\(=846600\)
A 1600
B 1500
C 3600
D 6300