Tính bằng cách thuận tiện nhất
9/4 × 13/10 - 3/4 × 11/10 + 3/4 : 10/72
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a: \(=\dfrac{4}{3}\cdot\dfrac{32}{10}+\dfrac{8}{3}\cdot\dfrac{36}{10}-\dfrac{4}{10}\cdot\dfrac{12}{9}\)
\(=\dfrac{128}{30}+\dfrac{288}{30}-\dfrac{48}{90}=\dfrac{416}{30}-\dfrac{24}{30}=\dfrac{392}{30}=\dfrac{196}{15}\)
\(\frac{13}{21}+3+\frac{29}{21}\)
\(=\frac{42}{21}+3\)
\(=2+3\)
\(=5\)
\(\frac{3}{4}+\frac{3}{5}+\frac{2}{8}+\frac{4}{10}\)
\(=\frac{3}{4}+\frac{3}{5}+\frac{1}{4}+\frac{2}{5}\)
\(=1+1\)
\(=2\)
a) \(\dfrac{5}{9}+\dfrac{13}{7}+\dfrac{15}{13}+\dfrac{8}{7}+\dfrac{4}{9}+\dfrac{11}{13}\)
\(=\left(\dfrac{5}{9}+\dfrac{4}{9}\right)+\left(\dfrac{13}{7}+\dfrac{8}{7}\right)+\left(\dfrac{15}{13}+\dfrac{11}{13}\right)\)
\(=1+3+2\)
\(=6\)
b) \(\dfrac{3}{5}+\dfrac{18}{9}+\dfrac{4}{10}\)
\(=0,6+2+0,4\)
\(=\left(0,6+0,4\right)+2\)
\(=1+2\)
\(=3\)
\(a\dfrac{5}{9}+\dfrac{4}{9}+\dfrac{13}{7}+\dfrac{8}{7}+\dfrac{15}{13}+\dfrac{11}{13}=\dfrac{9}{9}+\dfrac{21}{7}+\dfrac{26}{13}=1+3+2=6\)
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
=(1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)+20+10
=20+20+20+20+20+20+20+20+20+20+10
=20×10+10
=200+10
=210
= ( 1 + 19 ) + ( 2 + 18 ) + ( 3 + 17 ) + (4 + 16 ) + ( 5 + 15 ) + ( 6 + 14 ) + ( 7 + 13 ) + ( 8 + 12) + ( 9+ 11 ) + 20
= 20 + 20 + 20 +20 + 20 +20 + 20 + 20 + 20 +20
= 20 x 10
= 200
tui đầu tiên đó
=(1/11+10/11)+(2/11+9/11)+(3/11+8/11)+(4/11+7/11)+(5/11+6/11)
=11/11+11/11+11/11+11/11+11/11
=1+1+1+1+1
=5
\(\frac{9}{4}x\frac{13}{10}-\frac{3}{4}x\frac{11}{10}+\frac{3}{4}:\frac{10}{72}\)
\(=\frac{39}{4}x\frac{3}{10}-\frac{11}{4}x\frac{3}{10}+\frac{72}{4}x\frac{3}{10}\)
\(=\frac{3}{10}x\left(\frac{39}{4}-\frac{11}{4}+\frac{72}{4}\right)\)
\(=\frac{3}{10}x25\)
\(=\frac{15}{2}\)
= 3x3/4x13/10-3/4x11/10+3/4x72/10
= 3/4x(3x13/10-11/10+72/10)
= 3/4x10
=30/4
=15/2
mih nha