Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) 1 5 + 2 9 + 4 5 + − 11 9 + 3 7 = 1 5 + 4 5 + 2 9 + − 11 9 + 3 7 = 1 + ( − 1 ) + 3 7 = 3 7
b) − 7 31 + 24 17 + 7 31 + − 5 17 + 1 = − 7 31 + 7 31 + 24 17 + − 5 17 + 1 = 0 + 19 17 + 1 = 36 17
1 . ta co : \(x-96=\left(443-x\right)-15\)
\(\Rightarrow x-96=443-x-15\)
\(\Rightarrow x-96=428-x\)
\(\Rightarrow2\times x=524\)
\(\Rightarrow x=262\)
2. ta co : \(371+731+271+531\)
\(=370+1+730+1+270+1+530+1\)
\(=\left(370+530\right)+\left(730+270\right)+1+1+1+1\)
\(=900+1000+4=1904\)
1)x-96=(443-x)-15
x-96=443-x-15
x-96=443-15-x
x-96=428-x
x+x=428+96
2x=524
x=524:2=262
(p ơi đầu bài bài 2 sai r phải là :( 371+731-271-531) ms đúng
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) $(-42)-(370+58)-(120-370)$
$=-42-370-58-120+370$
$=(-42-58)+(-370+370)-120$
$=-100-120$
$=-220$
$Toru$
a) \(13+22+\left(-20\right)+\left(-153\right)+8=13+22-20-153+8\)
\(=\left(13-153\right)+\left(22+8\right)-20=-140+30-20=-130\)
b) \(371+731+\left(-271\right)+\left(-281\right)=371+731-271-281\)
\(=\left(371-271\right)+\left(731-281\right)=100+450=550\)
c) \(9+\left(-10\right)+11+\left(-12\right)+13+\left(-14\right)+15+\left(-16\right)\)
\(=9-10+11-12+13-14+15-16\)
\(=\left(9-10\right)+\left(11-12\right)+\left(13-14\right)+\left(15-16\right)\)
\(=\left(-1\right)+\left(-1\right)+\left(-1\right)+\left(-1\right)=-4\)
\(\left(527-34\right)+\left(-150+34-527\right)\)
\(=527-34-150+34-527=\left(527-527\right)+\left(-34+34\right)-150=-150\)
\(367+\left|-550\right|+\left|-33\right|-248-\left|-202\right|\)
\(=367+550+33-248-202=\left(367+33\right)-\left(248+202\right)+550=500\)
\(231.72+769.87+231.15=231\left(72+15\right)+769.87=87\left(231+769\right)=87000\)
a) $371+731-271-531$
$=(371-271)+(731-531)$
$=100+200$
$=300$
b) $57+58+59+60+61-17-18-19-20-21$
$=(57-17)+(58-18)+(59-19)+(60-20)+(61-21)$
$=40+40+40+40+40$
$=40\cdot5$
$=200$
c) $9-10+11-12+13-14+15-16$
$=(9-10)+(11-12)+(13-14)+(15-16)$
$=-1+(-1)+(-1)+(-1)$
$=-1\cdot4$
$=-4$
$\text{#}Toru$
\(769:15+731:15\\ =769\times\dfrac{1}{15}+731\times\dfrac{1}{15}\\ =\dfrac{1}{15}\times\left(769+731\right)\\ =\dfrac{1}{15}\times1500\\ =100\)
=(769+731):15
=1500:15
=100