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0,25 * 0,125 * 2011/2012 * 8 * 4 = ( 0,25 * 4 ) * ( 0,125 * 8 ) * 2011/2012 = 2011/2012
a) 39,66 x 43 + 171 x 13,22
= 39,66 x 43 + 57 x 3 x 13,22
= 39,66 x 43 + 57 x 39,66
= 39,66 x (43 + 57) = 39,66 x 100 = 3966.
A=36 x 350 + 1,2 x 20 x 3 + 9 x 4 x 4,5
= 12600 + 72 + 162
= 12834
\(A=\frac{18\times123+9\times567\times2+3\times310\times6}{25\times1,8\times4}\)
\(A=\frac{18\times123+9\times2\times567+3\times6\times310}{25\times4\times1,8}\)
\(A=\frac{18\times123+18\times567+18\times310}{100\times1,8}\)
\(A=\frac{18\times\left(123+567+310\right)}{180}\)
\(A=\frac{18\times1000}{180}\)
\(A=\frac{18000}{180}\)
\(A=100\)
A = \(\dfrac{2}{35}\) + \(\dfrac{4}{77}\) + \(\dfrac{2}{143}\) + \(\dfrac{4}{221}\) + \(\dfrac{2}{323}\) + \(\dfrac{4}{437}\) + \(\dfrac{2}{575}\)
A = \(\dfrac{2}{5\times7}\)+\(\dfrac{4}{7\times11}\)+\(\dfrac{2}{11\times13}\)+\(\dfrac{4}{13\times17}\)+\(\dfrac{2}{17\times19}\)+\(\dfrac{4}{19\times23}\)+\(\dfrac{2}{23\times25}\)
A = \(\dfrac{1}{5}\)-\(\dfrac{1}{7}\)+ \(\dfrac{1}{7}\) - \(\dfrac{1}{11}\)+\(\dfrac{1}{11}\)-\(\dfrac{1}{13}\)+\(\dfrac{1}{13}\)-\(\dfrac{1}{17}\)+\(\dfrac{1}{17}\)-\(\dfrac{1}{19}\)+\(\dfrac{1}{19}\)-\(\dfrac{1}{23}\)+\(\dfrac{1}{23}\)-\(\dfrac{1}{25}\)
A = \(\dfrac{1}{5}\) - \(\dfrac{1}{25}\)
A = \(\dfrac{4}{25}\)
a: \(A=\left(41.54+8.46\right)-\left(3.18+5.82\right)+\left(23.17-3.17\right)\)
=50-9+20
=70-9
=61
b: \(B=123.8-\left(34.15+5.84\right)+\left(-12.49+2.49\right)\)
\(=123.8-40-10=73.8\)
c: \(C=\left(32.18-2.18\right)+\left(36.42-6.42\right)+\left(13.93-3.93\right)\)
=30+30+10
=70
a: A=(41.54+8.46)−(3.18+5.82)+(23.17−3.17)A=(41.54+8.46)−(3.18+5.82)+(23.17−3.17)
=50-9+20
=70-9
=61
b: B=123.8−(34.15+5.84)+(−12.49+2.49)B=123.8−(34.15+5.84)+(−12.49+2.49)
=123.8−40−10=73.8=123.8−40−10=73.8
c: C=(32.18−2.18)+(36.42−6.42)+(13.93−3.93)C=(32.18−2.18)+(36.42−6.42)+(13.93−3.93)
=30+30+10
=70
97345-9205x3+7x9205
=97345-9205x(3+7)
=97345-9205x10
=97345-92050
=5295
=134165
Chúc Em Hok Tốt~