480:120=
840:120=
460:120=
220:120=
320:120=
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\(1440:\left[120-\left(3.9x\right)\right]=120\) \(120+\left[\left(999-9x\right):60\right].24=480\)
\(120-\left(3.9x\right)=1440:120\) \(\left[\left(999-9x\right):60\right].24=360\)
\(120-\left(3.9x\right)=12\) \(\left(999-9x\right):60=15\)
\(3.9x=120-12\) \(999-9x=900\)
\(3.9x=108\) \(9x=999-900\)
\(9x=108:3\) \(9x=99\)
\(9x=36\) \(x=99:9\)
\(x=4\) \(x=11\)
a) 120 x 40 > 120 : 40
b) 280 + 70 < 280 x 70
c) 320 – 80 > 320 : 80
d) 610 + 0 = 610 – 0
a) 480 mm + 120 mm = 600 mm 545 mm – 45 mm= 500 mm 840 mm : 3 = 280 mm | b) 465 g + 340 g = 805g 200 g x 5 = 1000g 900 g : 6= 150g | c) 500 ml + 156 ml = 656 ml 1 000 ml – 500 ml= 500ml 250 ml x 3 = 750ml |
Ta có :
120 = 23.3.5
320 = 26.5
ƯCLN(120,320)=23.5 = 4
Ta có :
168 = 23.3.7
120 = 23.3.5
144 = 24.32
ƯCLN(168,120,144)= 23.3 = 24
Ta có :
612 = 22.32.17
680 = 23.5.17
ƯLCN(612,680)= 22.17 = 68
anh oi mac du e k dung
nhung ma anh lam sai o phep dau y cai ket qua do
a) $420-(71+420)$
$=420-71-420$
$=-71$
b) $(35-120)+(120+410-35)$
$=35-120+120+410-35$
$=(35-35)+(-120+120)+410$
$=410$
c) $(320-15+49)-(85-51)$
$=320-15+49-85+51$
$=320+(-15-85)+(49+51)$
$=320+(-100)+100$
$=320$
d) $-(312+59)-(41+400+88)$
$=-312-59-41-400-88$
$=(-312-88)+(-59-41)-400$
$=-400+(-100)-400$
$=-500-400$
$=-900$
e) $(430-731)-(-731+430-56)$
$=430-731+731-430+56$
$=(430-430)+(-731+731)+56$
$=56$
f) $(1352-47)-(53-1000+1352)$
$=1352-47-53+1000-1352$
$=(1352-1352)+(-47-53)+1000$
$=(-100)+1000$
$=1000-100$
$=900$
h) $(-42)-(370+58)-(120-370)$
$=-42-370-58-120+370$
$=(-42-58)+(-370+370)-120$
$=-100-120$
$=-220$
$Toru$
480 ÷ x - 120 ÷ x = 60
(480 - 120) ÷ x = 60
360 ÷ x = 60
x = 360 ÷ 60
x = 6
(320 + x) : x + 120 = 131
(320 + x) : x = 131 - 120
(320 + x) : x = 11
320 : x + x : x = 11
320 : x + 1 = 11
320 : x = 11-1
320 : x = 10
x = 320 : 10
x = 32
( 320 + x ) : x + 120 = 131
( 320 + x ) : x = 131 - 120
( 320 + x ) : x = 11
320 : x + x : x = 11
320 : x + 1 = 11
320 : x = 11 - 1
320 : x = 10
x = 320 : 10
x = 32
480:120= 4
840:120= 7
460:120= \(\frac{23}{6}\)
220:120= \(\frac{11}{6}\)
320:120= \(\frac{8}{3}\)
480:120=4
840:120=7
460:120=3,833333...
220:120=1,833333...
320:120=2,6666...