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\(\left(a\right)37064-64\left(82+\frac{42966}{217}\right)\)
\(=37064-64\left(82+198\right)\)
\(=37064-64\cdot280\)
\(=30764-17920=19144\)
\(\left(b\right)320-\left(120,5+95,25+5,25\right)+\frac{84}{12}\cdot12,5\)
\(=320-\left(120,5+100,5\right)+7\cdot12,5\)
\(=320-221+87,5=11,5\)
\(\left(c\right)\left(4\frac{2}{5}+2\frac{3}{7}\right)-\left(2\frac{2}{5}-5\frac{4}{7}\right)\)
\(=4\frac{2}{5}-2\frac{2}{5}+2\frac{3}{7}+5\frac{4}{7}\)
\(=2+8=10\)
\(\left(d\right)\left(\frac{1998}{18}-\frac{1443}{13}\right)\left(16996-\frac{1110}{30}\cdot305\right)\)
\(=\left(111-111\right)\left(16996-\frac{1110}{30}\cdot305\right)\)
\(=0\left(16996-\frac{1110}{30}\cdot305\right)=0\)
\(\left(e\right)5\frac{3}{5}+1,75+6\frac{1}{8}+4\frac{1}{4}+3,875+3,4\)
\(=5\frac{3}{5}+1\frac{3}{4}+6\frac{1}{8}+4\frac{1}{4}+3\frac{7}{8}+3\frac{2}{5}\)
\(=5\frac{3}{5}+3\frac{2}{5}+1\frac{3}{4}+4\frac{1}{4}+6\frac{1}{8}+3\frac{7}{8}\)
\(=9+6+10=25\)
\(320-\left(120,5+95,25+5,25\right)+874:12.12,5\)
\(=320-\left(\frac{241}{2}+\frac{381}{4}+\frac{21}{4}\right)+874:12.\frac{25}{2}\)
\(=320-\left(\frac{241}{2}+\frac{201}{2}\right)+\frac{437}{6}.\frac{25}{2}\)
\(=320-221+\frac{10925}{12}\)
\(=99+\frac{10925}{12}=\frac{12113}{12}\)
Chú thích: Dấu nhân thay bằng dấu .
a) 0,48 x 500 - 2,4 x 40 x 2
= 240 - 2,4 x 40 x 2
= 237,6 x 80
= 18008
a) 0,48x500-2,4x40x2
=240-92x2
=240+192
=432.
b) hình như sai đề thì phải.
120 x 64 + 320 - 25 x 4 x 16 = 120 x 4 x 16 + 20 x 16 - 100 x 16
= 480 x 16 + 20 x 16 - 100 x 16
= 16 x (480 + 20 - 100)
= 16 x 400
= 6400
320 - ( 120,5 + 95,25 + 5,25 ) + 84 : 12 x 12,5
= 320 - 221 + 84 : 12 x 12,5
= 320 - 221 + 7 x 12,5
= 320 - 221 + 87,5
= 99 + 87,5
= 186,5
tk mink nha
Bài 1
a) \(5\times72\times10\times2=\left(5\times2\times10\right)\times72=100\times72=7200\)
b) \(40\times125=5\times\left(8\times125\right)=5\times1000=5000\)
c) \(16\times6\times25=4\times4\times6\times25=\left(4\times6\right)\times\left(4\times25\right)=24\times100=2400\) Bài 2:
a) \(24\times57+43\times24=24\times\left(57+43\right)=24\times100=2400\)
b) \(12\times19+80\times12+12=12\times\left(19+80+1\right)=12\times100=1200\)
c) \(\left(36\times15\times169\right)\div\left(5\times18\times13\right)\)
\(=\left(18\times2\times3\times5\times13\times13\right)\div\left(5\times18\times13\right)\)
\(=\left(2\times3\times13\right)\times\left(18\times5\times13\right)\div\left(5\times18\times13\right)\)
\(=2\times3\times13\)
\(=78\)
d) \(\left(44\times52\times60\right)\div\left(11\times13\times15\right)\)
\(=\left(4\times11\times4\times13\times4\times15\right)\div\left(11\times13\times15\right)\)
\(=\left(4\times4\times4\right)\times\left(11\times13\times15\right)\div\left(11\times13\times15\right)\)
\(=4\times4\times4\)
\(=64\)
Bài 3:
a) \(x-280\div35=5\times54\)
\(x-8=270\)
\(x=270+8\)
\(x=278\)
b) \(\left(x-280\right)\div35=54\div4\)
\(\left(x-280\right)\div35=\dfrac{27}{2}\)
\(x-280=\dfrac{27}{2}\times35\)
\(x-280=\dfrac{945}{2}\)
\(x=\dfrac{945}{2}+280\)
\(x=\dfrac{1505}{2}\)
c) \(\left(x-128+20\right)\div192=0\)
\(x-128+20=0\times192\)
\(x-128+20=0\)
\(x-128=0-20\)
\(x-128=-20\)
\(x=-20+128\)
\(x=108\)
d) \(4\times\left(x+200\right)=460+85\times4\)
\(4\times\left(x+200\right)=460+340\)
\(4\times\left(x+200\right)=800\)
\(x+200=800\div4\)
\(x+200=200\)
\(x=200-200\)
\(x=0\)
Bài 4:
a) \(\dfrac{7}{12}-\dfrac{5}{12}=\dfrac{2}{12}=\dfrac{1}{6}\)
b) \(\dfrac{8}{11}+\dfrac{19}{11}=\dfrac{27}{11}\)
c) \(\dfrac{3}{8}+\dfrac{5}{12}=\dfrac{9}{24}+\dfrac{10}{24}=\dfrac{19}{24}\)
d) \(\dfrac{3}{4}+\dfrac{7}{12}=\dfrac{9}{12}+\dfrac{7}{12}=\dfrac{16}{12}=\dfrac{4}{3}\)
Bài 5:
a) \(x-\dfrac{6}{7}=\dfrac{5}{2}\)
\(x=\dfrac{5}{2}+\dfrac{6}{7}\)
\(x=\dfrac{47}{14}\)
b) \(\dfrac{12}{7}\div x+\dfrac{2}{3}=\dfrac{7}{5}\)
\(\dfrac{12}{7}\div x=\dfrac{7}{5}-\dfrac{2}{3}\)
\(\dfrac{12}{7}\div x=\dfrac{11}{15}\)
\(x=\dfrac{12}{7}\div\dfrac{11}{15}\)
\(x=\dfrac{180}{77}\)
37064 - 64 x ( 82 + 42966 : 217 )
= 37064 - 64 x ( 82 + 198 )
= 37064 - 64 x 280
= 37064 - 17920
= 19144
b) 320 - ( 120 x 5 + 95, 25 + 5,25 ) + 864 : 12 x 12,5
= 320 - ( 600 + 95, 25 + 5,25 ) + 864 : 12 x 12,5
= 320 - ( 695.25 + 5,25) + 72 x 12,5
= 320 - 700.5 + 900
= -380,5 + 900
= 520
37064 - 64 x ( 82 + 42966 : 217 )
= 37064 - 64 x ( 82 + 198 )
= 37064 - 64 x 280
= 37064 - 17920
= 19144
b) 320 - ( 120 x 5 + 95, 25 + 5,25 ) + 864 : 12 x 12,5
= 320 - ( 600 + 95, 25 + 5,25 ) + 864 : 12 x 12,5
= 320 - ( 695.25 + 5,25) + 72 x 12,5
= 320 - 700.5 + 900
= -380,5 + 900
= 520
chúc bn hok tốt @_@