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Bài 1
-927+1421+930+(-1421)
(-50+19+143)-(-79+25+48)
2.(-25).(-4).50
-{-2+5-[10-(6-30)].-27-3}
/0/+/45/+(-/-455/+/-796/)
(-134)+51.134+(-134).48
Bài 2
15(13+x)=24-18
x+(-32)-(-42)-(-9)=-52
5-x=17-(-5)
x+2x+x+91=-5
-152-(3x+1)=(-2).(-27)
(3x-4) ²=5-(-11)
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Đáp án:
`-927+1421+930+(-1421)`
`= (-927 + 930 ) +( -1421 + 1421)`
`= 3 + 0 = 3`
`(-50+19+143)-(-79+25+48)`
`=112 + 6`
`= 118`
`2.(-25).(-4).50 -{-2+5-[10-(6-30)].-27-3}`
`= 1000 – { 3 – (10+24).(-27)-3}`
`= 1000- { 3 +918 -3}`
`= 1000 – 918`
`= 2`
`|0|+|45|+(-|-455|+|-796|)`
`= 0 + 45 +(-455 + 796)`
`= 45 + 341`
` = 386`
`(-134)+51.134+(-134).48`
`= -134 + 51 .134 + 134.(-48)`
`= -134 + 134.(51-48)`
`= -134 + 134 . 3`
`= -134 + 402 = 268`
Bài 2
`15(13+x)=24-18`
`15(13+x)=6`
`13+x = 2/5`
`x = -63/5`
Vậy …
`x+(-32)-(-42)-(-9)=-52`
`x + 19 = -52`
`x = -71`
vậy …
`5-x=17-(-5)`
`5-x = 22`
`-> x = 17`
vậy…
`x+2x+x+91=-5`
`4x + 91 = -5`
`-> 4x = -96`
`-> x = -24`
Vậy …
`-152-(3x+1)=(-2).(-27)`
`-152 – (3x+1) = 54`
`3x+1 = -206`
`-> 3x = -207`
`-> x = -69`
vậy …
`(3x-4) ²=5-(-11)`
`(3x-4)^2 = 16=(±8)^2`
`->` Th1 :
`3x-4 = 8`
`-> 3x = 12`
`-> x =4`
Th2:
`3x-4 = -8`
`-> 3x = -4`
`-> x = -4/3`
Vậy `x ∈ { -4/3;4}`
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