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a)31.65+31.35-500
=31.(65+35)-500
=31.100-500
=3100-500
=2600
b) 73.9+ 32.74- 45.539
=343.9+9.2401-45.539
=9.(343+2401)-45.539
=9.2744-24355
=24696-24355
=341
a) 132- (116-(132-1282))
=132- ( 116-(132-16384))
=132-(116+16252)
=132-16368
=16236
a) 52x-3 -2.52 = 52.3
52x.125 = 52.3 + 2.52
52x.125 = 125
52x = 1 = 50
=> 2x = 0 => x =0
b) \(A=\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}+\frac{1}{110}+\frac{1}{132}\)
\(A=\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}+\frac{1}{10.11}+\frac{1}{11.12}\)
\(A=\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+...+\frac{1}{10}-\frac{1}{11}+\frac{1}{11}-\frac{1}{12}\)
A = 1/5 - 1/12
A = 7/60
\(a.132-\left[116-4^2\right]\) \(c.120:\left\{300:\left[150-\left(2.125-8.25\right)\right]\right\}\)
= \(132-\left[116-16\right]\) = \(120:\left\{300:\left[150-\left(250-200\right)\right]\right\}\)
= \(132-100\) = \(120:\left\{300:\left[150-50\right]\right\}\)
= \(32\) = \(120:\left\{300:100\right\}\)
= \(120:3\)
= \(40\)
132 - [ 116 - ( 132 - 128 )2 ] { 46 - [( 16 + 71 , 4 ) : 15 ]} -2 Ý cuối cùng mình làm luôn cứ thế mà
= 132 - [ 116 - 16 ] = { 46 - [ 87,4 : 15] } - 2 chép.
=132 - 100 = { 46 - 5,8266 } - 2 = 120 : { 300 : [ 150 - ( 210 - 200) ]}
= 32 = 40,1734 - 2 = 120 : { 300 : [ 150 - 10 ]}
=38,1734m = 120 : { 300 : 140 }
= 120 : 2,1428
= 56,0014
SAI THÌ THÔI NHA !
a) \(\left[\left(10-2.30.5\right)+2.6\right]:2+\left(4.5\right)^2\)
\(=\left[\left(10-300\right)+2.6\right]:2+20^2\)
\(=\left(-290+2.6\right):2+400\)
\(=\left(-290+12\right):2+400\)
\(=-278:2+400\)
\(=-139+400\)
\(=-\left(139-400\right)\)
\(=-\left(-261\right)\)
\(=261\)
b) \(536.27-9\left(825+219\right):18+15^3:15^2.4^2.3\)
\(=536.27-9.1044:18+15^3:15^2.4^2.3\)
\(=14472-9396:18+15^3:15^2.4^2.3\)
\(=14472-522+15^3:15^2.4^2.3\)
\(=13920+15^{3-2}.4^2.3\)
\(=13920+15.4^2.3\)
\(=13920+15.16.3\)
\(=13920+240.3\)
\(=13920+720\)
\(=14640\)
1) 22.25.17.+5.20.27+102.56
=4.25.17+5.20.27+100.56
=100.17+100.27+100.56
=100(17+27+56)
=100.100
=10000
2) 132-[116-(132-1282)]
=132-[116-(132-16384)]
=132-[116-(-16252)]
=132-(116+16252)
=132-16368
=-16236
3) 4.52-81:32
=4.25-34:32
=100-34-2
=100-32
=100-9
=91
A)10000
B)16236
c)91
mk nha!