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42 x 3 + 18 x 32 + 18 x 61
= 6 x 7 x 3 + 18 x 32 + 18 x 61
= 18 x 7 + 18 x 32 + 18 x 61
= 18 x (7 + 32 + 61)
= 18 x 100
= 1800
\(42\times3+18\times32+18\times61\)
\(=6\times7\times3+18\times32+18\times61\)
\(=18\times7+18\times32+18\times61\)
\(=18\times\left(7+32+61\right)\)
\(=18\times100\)
\(=1800\)
=( 4,5 x 2,7 + 4,5 x 3,6 + 4,5 x 1,8) x [35,2 - ( 32 + 3,2)
= ( 4,5 x 2,7 + 4,5 x 3,6 + 4,5 x 1,8) x ( 35,2 - 35,2)
= ( 4,5 x 2,7 + 4,5 x 3,6 + 4,5 x 1,8) x 0
= 0
(4,5 x 2,7+ 4,5 x 3,6 + 4,5 x 1,8 ) x (3,2 x11-32 -3,2)
= ( 45 x 36 x 1,8 + 2,7 + 4,5) x ( 3,2 x 11 - 32 - 3,2 )
= =2923.2 x 0
= 0
\(1,\\ a,=\dfrac{7}{19}\times\left(\dfrac{1}{3}+\dfrac{2}{3}\right)=\dfrac{7}{19}\times1=\dfrac{7}{19}\\ b,=\dfrac{2}{5}+\left(\dfrac{3}{4}+\dfrac{1}{4}\right)=\dfrac{2}{5}+1=\dfrac{7}{5}\\ 2,\\ a,=15\times\left(\dfrac{2121}{4343}+\dfrac{222222}{434343}\right)\\ =15\times\left(\dfrac{2121:101}{4343:101}+\dfrac{222222:10101}{434343:10101}\right)\\ =15\times\left(\dfrac{21}{43}+\dfrac{22}{43}\right)=15\times\dfrac{43}{43}=15\times1=15\)
\(3,\)
Cạnh \(AC=\) chu vi ABC \(-AB-BC=\dfrac{4}{5}-\dfrac{1}{5}-\dfrac{1}{4}=\dfrac{3}{5}-\dfrac{1}{4}=\dfrac{7}{20}\left(m\right)\)
Vì \(\dfrac{7}{20}>\dfrac{5}{20}>\dfrac{4}{20}\Rightarrow\dfrac{7}{20}>\dfrac{1}{4}>\dfrac{1}{5}\) nên \(AC>BC>AB\)
16x48+8x48+16x28= 16x48+16x24+16x28
=16x(48+24+28)
=16x100
=1600
Ta có:\(\frac{23,26\cdot32\cdot0,6}{0,32\cdot6}\Leftrightarrow\frac{2,326\cdot0,32\cdot6}{0,32\cdot6}=\frac{2,326}{1}=2,326\)
64 x 8 + 48 x 4 + 6 x16
= 64 x2 x4 + 48 x 4 + 6 x 4 x 4
= 128 x 4 + 48 x4 + 24 x 4
= ( 128 + 48 + 24 ) x 4
= 200 x 4
= 800
16*234+8*776*2=16*234+(8*2)*776=16*234+16*776=16*(234+776)=16*1000=16000
16 x 234 + 8 x 776 x 2
= ( 16 x 234 ) + 8 x ( 778 x 2 )
= 3744 + 8 x 1556
= 3752 x 1556
= 5838112