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a) 3 m 40 cm + 4 m 24 cm - 5 m 69 cm = 340 cm + 424 cm - 569 cm = 195 cm
b) 72 m 6 cm - 56 m 50 cm + 7 m 44 cm = 7206 cm - 5650 cm + 744 cm = 2300 cm
c) 8 m 27 dm + 3 m 35 cm + 3 m 65 cm = 1070 cm + 335 cm + 365 cm = 1770 cm
d) 98 m 20 cm x 2 + 23 m 30 cm x 2 = 9820 cm x 2 + 2330 cm x 2 = 19640 cm + 4660 cm = 24300 cm
e) 18 m 40 cm x 4 + 80 m 5 dm x 8 = 1840 cm x 4 + 8050 cm x 8 = 7360 cm + 64400 cm = 71760 cm
f) 87 m 23 dm : 2 = 8930 cm : 2 = 4465 cm
g) 9 m 8dm 7 cm : 3 = 987 cm : 3 = 329 cm
h) 90 dm 30 cm x 10 = 930 cm x 10 = 9300 cm
i) 19 dm 8 cm : 3 = 198 cm : 3 = 66 cm
j) 36 m 8 dm 7 cm : 3 = 3687 cm : 3 = 1229 cm
a) 3 m 40 cm + 4 m 24 cm - 5 m 69 cm = 340 cm + 424 cm - 569 cm = 195 cm
b) 72 m 6 cm - 56 m 50 cm + 7 m 44 cm = 7206 cm - 5650 cm + 744 cm = 2300 cm
c) 8 m 27 dm + 3 m 35 cm + 3 m 65 cm = 1070 cm + 335 cm + 365 cm = 1770 cm
d) 98 m 20 cm x 2 + 23 m 30 cm x 2 = 9820 cm x 2 + 2330 cm x 2 = 19640 cm + 4660 cm = 24300 cm
e) 18 m 40 cm x 4 + 80 m 5 dm x 8 = 1840 cm x 4 + 8050 cm x 8 = 7360 cm + 64400 cm = 71760 cm
f) 87 m 23 dm : 2 = 8930 cm : 2 = 4465 cm
g) 9 m 8dm 7 cm : 3 = 987 cm : 3 = 329 cm
h) 90 dm 30 cm x 10 = 930 cm x 10 = 9300 cm
i) 19 dm 8 cm : 3 = 198 cm : 3 = 66 cm
j) 36 m 8 dm 7 cm : 3 = 3687 cm : 3 = 1229 cm
Học tốt hem:)))
\(\left(\frac{1}{3}+\frac{4}{2}\cdot\frac{1}{2}\right):\left(\frac{18}{9}-113\right)\)
\(=\left(\frac{1}{3}+1\right):\left(2-113\right)\)
\(=\frac{4}{3}:\left(-111\right)\)
\(=\frac{-4}{333}\)
A. \(\left(x+1\right)+\left(x+2\right)+......+\left(x+100\right)=5750\)
\(x+1+x+2+....+x+100=5750\)
\(100x+\left(1+2+3+.......+100\right)=5750\)
\(100x+5050=5750\)
\(100x=700\)
\(x=700:100=7\)
B. x+(1+2+......+100) = 2000
x + 5050 = 2000
x = 2000 - 5050
x= -3050
C. ( x-1 )+(x-2)+......+( x - 100 ) = 50
x-1+x-2+.........+x-100 = 50
100x + ( -1-2-........-100 ) = 50
100x + ( - 5050 ) = 50
100x = 50 + 5050
100 x = 5100
x = 5100 : 100
x = 51
A . \(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)
\(\left(x+x+x+...+x\right)+\left(1+2+3+...+100\right)=5750\)
\(100x+5050=5750\)
\(100x=5750-5050\)
\(100x=700\)
\(\Rightarrow x=\frac{700}{100}=7\)
B. \(x+\left(1+2+3+4+5+....+100\right)=2000\)
\(x+\frac{\left(100+1\right).100}{2}=2000\)
\(x+5050=2000\)
\(\Rightarrow x=2000-5050=-3050\)
C. \(\left(x-1\right)+\left(x-2\right)+\left(x-3\right)+....+\left(x-100\right)=50\)
\(\left(x+x+x+...+x\right)-\left(1+2+3+...+100\right)=50\)
\(100x-5050=50\)
\(100x=5100\)
\(\Rightarrow x=\frac{5100}{100}=51\)
\(\frac{3}{2\times5}+\frac{2}{5\times8}+\frac{3}{8\times11}+...+\frac{3}{602\times605}\)
\(=\frac{5-2}{2\times5}+\frac{8-5}{5\times8}+\frac{11-8}{8\times11}+...+\frac{605-602}{602\times605}\)
\(=\frac{1}{2}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{11}+...+\frac{1}{602}-\frac{1}{605}\)
\(=\frac{1}{2}-\frac{1}{605}=\frac{603}{1210}\)
\(\frac{4}{3\times7}+\frac{5}{7\times12}+\frac{1}{12\times13}+\frac{2}{13\times15}\)
\(=\frac{7-4}{3\times7}+\frac{12-7}{7\times12}+\frac{13-12}{12\times13}+\frac{15-13}{13\times15}\)
\(=\frac{1}{3}-\frac{1}{7}+\frac{1}{7}-\frac{1}{12}+\frac{1}{12}-\frac{1}{13}+\frac{1}{13}-\frac{1}{15}\)
\(=\frac{1}{3}-\frac{1}{15}=\frac{4}{15}\)
\(\frac{1}{2004}+2+\frac{1}{2004}+3+\frac{2}{2004}\)
\(=\frac{1}{2004}+\frac{2}{1}+\frac{1}{2004}+\frac{3}{1}+\frac{2}{2004}\)
\(=\frac{1}{2004}+\frac{4008}{2004}+\frac{1}{2004}+\frac{6012}{2004}+\frac{2}{2004}\)
\(=\frac{4009}{2004}+\frac{1}{2004}+\frac{6012}{2004}\)\(+\frac{2}{2004}\)
\(=\frac{4010}{2004}+\frac{6012}{2004}+\frac{2}{2004}\)
\(=\frac{10022}{2004}+\frac{2}{2004}\)
\(=\frac{10024}{2004}\)