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\(27.77+24.27-27\)
\(=27.\left(77+24-1\right)\)
\(=27.100\)
\(=2700\)
\(174\div\left\{2\left[36+\left(4^2-23\right)\right]\right\}\)
\(=174\div\left\{2\left[36+\left(16-23\right)\right]\right\}\)
\(=174\div\left\{2\left[36+\left(-7\right)\right]\right\}\)
\(=174\div\left\{2.29\right\}\)
\(=174\div58\)
\(=3\)
\(3^2.4-\left[30-\left(5-2\right)^2\right]\)
\(=9.4-\left[30-3^2\right]\)
\(=36-\left[30-9\right]\)
\(=36-21\)
\(=15\)
`a,`
`31/23-(7/32+8/23)`
`=31/23-7/32-8/23`
`=(31/23-8/23)-7/32`
`=1-7/32=25/32`
`b,`
`38/45-(8/45-17/51-3/11)`
`=38/45-8/45+17/51+3/11`
`= (38/45-8/45)+17/51+3/11`
`=2/3+17/51+3/11`
`=1+3/11=14/11`
`c,`
`(1/3+12/67+13/41)-(79/67-28/41)`
`= 1/3+12/67+13/41-79/67+28/41`
`= 1/3+(12/67-79/67)+(13/41+28/41)`
`= 1/3+(-1)+1=1/3+(-1+1)=1/3+0=1/3`
`d,`
`1/5+(-1/6)+1/7+(-1/8)+1/9+1/8+(-1/7)+1/6+(-1/5)`
`= (1/5+ -1/5)+(-1/6+1/6)+(1/7+ -1/7)+(-1/8 +1/8)+1/9`
`= 0+0+0+0+1/9=1/9 .`
a) 80- (4.52 - 3.23)
= 80- ( 208 -69 )
=80+139 quy tắc đổi dấu trừ tước dấu ngoặc
= 219
e: Ta có: \(2448:\left[119-\left(23-6\right)\right]\)
\(=2448:\left(119-23+6\right)\)
\(=2448:102=24\)
a: =-11/23(6/7+8/7)-1/23
=-22/23-1/23
=-1
b: =21/23-21/23+125/143-125/143
=0
b) 36 : 3 2 + 3 2 . 2 3 -150
= 36 : 9 + 9 . 8 – 1 = 4 + 72 – 1 = 76 – 1 = 75
