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36.28 + 36.82 + 64.69 + 64.41
36.{ 28 + 82 } + 64 . { 69 + 41 }
36.110 + 64 .110
{ 36 + 64 } .110
100 . 110
11 000
phần 1 = 24 x (31+42+27)=24 x 100=2400
phần 2 = (36 x (28+82)) + (64 x (69+41)) = (36x110) + (64x110) = 110 x (36+64) = 110x100=11000
Câu 1:
36x28+36x82+64x69-64x41=36x(28+82)+64x(69-41)
=36x110+64x28
=3960+1792
=5752
36( 28+82 ) + 64 ( 64+41 )
= 36( 28 + 82 + 128 + 82 )
=36 x 320 = 11520
1) a) \(35.34+35.58+65.75+65.45\)
\(=35\left(34+58\right)+65\left(75+45\right)\)
\(=35.92+65.120\)
\(=3220+7800=11020\)
b) \(39,8+60,2+21,8-100\)
\(=\left(39,8+60,2\right)-100+21,8\)
\(=100-100+21,8=0+21,8=21,8\)
c) \(36.28+64.49+36.82+41.64\)
\(=36\left(28+82\right)+64\left(49+41\right)\)
\(=36.110+64.90\)
\(=3960+5760\)\(=9720\)
\(\Leftrightarrow x\left(\dfrac{1}{2}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{11}+\dfrac{1}{11}-\dfrac{1}{14}\right)=\dfrac{1}{21}\)
\(\Leftrightarrow x\cdot\dfrac{2}{7}=\dfrac{1}{21}\)
hay \(x=\dfrac{1}{21}:\dfrac{2}{7}=\dfrac{1}{6}\)
36 x 28 + 36 x 82 + 64 x 69 + 64 x 41
= 36 x ( 28 + 82 ) + 64 x ( 69 + 41 )
= 36 x 110 + 64 x 110
= ( 36 + 64 ) x 110
= 100 x 110
= 11 000
k mình nha !
=36 x(28+82) +64x(69+41)
=36x110+64x110
=(36+64)x110
=100x110=11000
easy