( -2005) -[(- 257+156) -56]
-257-[(-257+156)-56]
- 257 - [ (-257 + 156) - 56]
= -257 + 257 - 156 - 56
= (-257 + 257) - (156 - 56)
= - 100
Tính nhanh : (-257)-{(-257+156)-56}
=(-257)-{-257+156-56}
=-257+257-156+56
=0+-156+56
=-100
(-257)-{(-257+156)-56}
<=> (-257)-(-101-56)
<=> (-257)-(-157)
<=> -100
-257 - [(-127 + 156) - 56]
-257 - [(-127 + 156) - 56]
= -257 + 127 - 156 + 56
= - (257 - 127) - (156 - 56)
= - 130 - 100
= - 230
-257 - [(-127 + 156) - 56]
= -257 - [-127 + 156 - 56]
= -257 - [-127 + 100]
= -257 + 27
= -230
-257 - [(-127 + 156) - 56]
= -257 + 127 - 156 + 56
= - (257 - 127) - (156 - 56)
= - 130 - 100
= - 230
Bỏ ngoặc rồi tính:
(-257)-[(-257+156)-56]
(-257)-[(-257+156)-56]
=(-257)-(-257+156-56)
=(-257)-(-257+100)
=-257+257-100
=(-257+257)-100
=0-100
=-100
(-257)-[(-257+156)-56]
=(-257)+257+156-56
=[(-257)+257]+(156-56)
=0+100
=100
k cho mk nha b
M.n giúp mk với tại sao khi:
-257 + 257 - 156 + 56 = -100
-257 + 257 - 156 + 56 =0-156+56=-100
(-257)-[(-257+156)-56]
Ai giải được và nhanh nhất mình tích 4 like: giải ra luôn nha
(-257)-[(-257+156)-56]=-257-[-257+156-56]=(-257+257)+(156-56)=0+100=100
(-257)-[(-257+156)-56]=(-257)-[(-257+(156-56)]=(-257)-(-257)+100=-257+257+100=0+100=100
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a) 80-(4.52-3.23)
b) 23.75+25.23+180
c)(-257)-[(-257)+156-56
d) (-3)-(4-6)
b)23.75+25.23+180
23.(75+25)+180
23.100+180
2300+180
2480
c)
-257-(-257)+100
(-257+257)+100
0+100
100
d)
-3-4+6
-3+(-4)+6
-7+6
-1
a ( - 59 + 71 - { - 83 - ( 95 )}
b - 257 - {( - 257 + 156 ) - 56 }
c ( 435 - 167 ) - 89 ( 435 - 89 )
d -329 + ( 15 - 101 ) - ( 25 - 440 )
e ( 116 + 124 ) + ( 215 - 116 - 124 )
f 4524 - ( 864 - 999 ) - ( 36 - 999 )
a: \(-59+71-\left\{-83-\left(95\right)\right\}\)
\(=71-59+81+95\)
\(=12+81+95\)
\(=93+95=188\)
b: \(-257-\left\{\left(-257+156\right)-56\right\}\)
\(=-257-\left(-257+156-56\right)\)
\(=-257-\left(-257+100\right)\)
\(=-257+257-100=-100\)
c: Sửa đề:\(\left(435-167\right)-89-\left(435-89\right)\)
\(=435-167-89-435+89\)
=\(\left(435-435\right)+\left(-89+89\right)-167\)
=0+0-167
=-167
d: \(-329+\left(15-101\right)-\left(25-440\right)\)
\(=-329+15-101-25+440\)
\(=\left(440-329-101\right)+\left(15-25\right)\)
=10-10
=0
e: \(\left(116+124\right)+\left(215-116-124\right)\)
\(=116+124+215-116-124\)
\(=\left(116-116\right)+\left(124-124\right)+215\)
=0+0+215
=215
f: \(4524-\left(864-999\right)-\left(36-999\right)\)
\(=4524-864+999-36+999\)
\(=4524-\left(864+36\right)+999\cdot2\)
\(=4524-900+1998=5622\)
tìm x biết x+1/156+x+2/155+x+3/154+x+257/30=0