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(1267 - 196) - (267 - 204)
= 1267 - 196 - 267 + 204
= (1267 - 267) + (204 - 196)
= 1000 + 8
= 1008
(3965 - 2378) - (437 - 1378) - 528
= 3965 - 2378 - 437 + 1378 - 528
= 3965 - (437 + 528) - (2378 - 1378)
= 3965 - 965 - 1000
= 3000 - 1000
= 2000
2002 - 79 + 15 - (-79) - 15
= 2002 - (79 - 79) + (15 - 15)
= 2002 - 0 + 0
= 2002
-329 - (15 - 101) - (25 - 440)
= - 329 - 15 + 101 - 25 + 440
= (440 + 101 - 329) - (15 + 25)
= (541 - 329) - 40
= 212 - 40
= 172
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: \(4524-\left(864-999\right)-\left(36-999\right)\)
\(=4524-864+999-36+999\)
\(=4524-\left(864+36\right)+999\cdot2\)
\(=4524-900+1998=5622\)
a: =387-87-224=300-224=76
b: =-75-25+329
=329-100=229
c: =-21-27+31+24=-48+55=7
d: =21(23+17)=21*40=840
e: =12-57+57-12
=0
f: =-6(36+64)=-6*100=-600
1. \(\left(387-41\right)-\left(81+13\right)\)
\(=346-94=252\)
2. \(\left(83+81\right)-\left(81+13\right)\)
\(=83+81-81-13\)
\(=70\)
3. \(281-\left(-37\right)+83-181\)
\(=281-181+37+83\)
\(=100+120=220\)
4. \(87-\left(-13\right)+\left(-21\right)-79\)
\(=87+13-21-79\)
\(=100-100=0\)
5. \(\left(-172\right)+\left(-43\right)+72-57\)
\(=-172+72-43-57\)
\(=-100-100=-200\)
(-50 + 19 + 143)-(-79 + 25 +48)
= (-31 + 143 ) - (-54 + 48 )
= 112 - (-6)
= 112 + 6
= 118
\(\left(-50+19+143\right)-\left(-79+25+48\right)\)
\(=-50+19+143+79-25-48\)
\(=-50-25+\left(79-48+19\right)+143\)
\(=-75+50+143\)
\(=-25+143\)
\(=118\)
a)4*x+79*29=79*33
4*x+2291=2607
4*x=2607-2291=316
x=316:4=79
b)83-3*(7+x)=64
3*(7+x)=83- 64=19
7+x=19:3=19/3
x=19/3-7=-2/3
Xin lỗi! Mình chưa học tới số nguyên! Mong bạn thông cảm!!@@