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a) 73,5 x 35,64 + 73,5 x 64,36
= 73,5 x ( 35,64 + 64,36 )
= 73,5 x 100
= 7350
b) 6,48 x 11,25 - 6,48 x 0,25 - 6,48
= 6,48 x ( 11,25 - 0,25 - 1 )
= 6,48 x 10
= 64,8
c) 250 x 16 - ( 608 + 396 + 3,5 )
= 250 x 16 - 1007,5
= 4000 - 1007,5
= 2992,5
d) ( 440 + 480 : 12 ) - 120 : 0,25 + 7,8 x 3,5 x 2
= 680 - 120 : 0,25 + 7,8 x 3,5 x 2
= 680 - 480 + 54,6
= 200 + 54,6
= 254,6
~ nhé ! Mơn ạ ~
~ Hok tốt ~
Bài làm:
a) \(A=\left|x-0,25\right|\ge0\left(\forall x\right)\)
Dấu "=" xảy ra khi: \(\left|x-0,25\right|=0\Rightarrow x=0,25\)
Vậy GTNN A là 0 khi x = 0,25
b) \(B=\left|x+0,25\right|+1,75\ge1,75\left(\forall x\right)\)
Dấu "=" xảy ra khi: \(\left|x+0,25\right|=0\Rightarrow x=-0,25\)
Vậy GTNN B là 1,75 khi x = -0,25
\(y.0,25-0,4.9,5+y=0,25.\)
\(\Leftrightarrow0,25y-3,8+y=0,25.\)
\(\Leftrightarrow1,25y=4,05.\)
\(\Leftrightarrow y=3,24.\)
Vậy phương trình có nghiệm \(y\in\left\{3,24\right\}.\)
1. \(x-8+32=68\)
\(x-8=68-32\)
\(x-8=36\)
\(x=36+8\)
\(x=44\)
_____
2. \(x+8+32=68\)
\(x+8=68-32\)
\(x+8=36\)
\(x=36-8\)
\(x=28\)
_____
3. \(98-x+34=43\)
\(98-x=43-34\)
\(98-x=9\)
\(x=98-9\)
\(x=89\)
_____
4. \(98+x-34=43\)
\(98+x=43+34\)
\(98+x=77\)
\(x=77-98\)
\(x=-21\)
_____
5. \(x:5:4=800\)
\(x:5=800.4\)
\(x:5=3200\)
\(x=3200.5\)
\(x=16000\)
_____
6. \(18+x=384:8\)
\(18+x=48\)
\(x=48-18\)
\(x=30\)
_____
7. \(\left(84,6-2\times x\right):3,02=5,1\)
\(84,6-2.x=5,1.3,02\)
\(84,6-2.x=15,402\)
\(2.x=84,6-15,402\)
\(2.x=69,198\)
\(x=69,198:2\)
\(x=34,599\)
_____
8. \(x\times5=120:6\)
\(x.5=20\)
\(x=20:5\)
\(x=4\)
_____
9. \(\left(15\times24-x\right):0,25=100:0,25\)
\(\left(15.24-x\right):0,25=400\)
\(15.24-x=400.0,25\)
\(15.24-x=100\)
\(360-x=100\)
\(x=360-100\)
\(x=260\)
1,x-8+32=68
=>x-8=68-32=36
=>x=36+8=42
2,x+8+32=68
=>x+8=68-32=36
=>x=36-8=28
3,98-x+34=43
=>98-x=43-34=9
=>x=98-9=89
4,98+x-34=43
=>98+x=43+34=77
=>x=77-98=-21
5,x:5:4=800
=>x:20=800
=>x=800x20=16000
6,18+x=384:8=48
=>x=48-18=30
7,(84,6-2x):3,02=5,1
=>84,6-2x=5,1x3,02=15,402
=>2x=84,6-15,402=69,198
=>x=69,198:2=34,599
8,5x=120:6=20
=>x=20:5=4
9,(15x24-x):0,25=100:0,25=400
=>360-x=400x0,25=100
=>x=360-100=260.
0,25*843+0,25-843:2
= (0,25*843)+0,25-(843:2)
= 210,75+0,25-421,5
= -210,5
\(0,25.843+0.25-\frac{843}{2}\)
\(=0,25.\left(843+1\right)-\frac{843}{2}\)
\(=\frac{1}{4}.844-\frac{843}{2}\)
\(=\frac{1}{2}.422-\frac{1}{2}.843\)
\(=\frac{1}{2}.\left(422-843\right)\)
còn bao nhiêu tính nốt giùm mk nha