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\(2005-5+5+5+...+5+5\)
\(=2005-5+\left(5+5+...+5\right)\)
\(=2005-5+50\)
\(=2000+50=2050\)
PP/ss: Chắc z ((:
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= 5 x 107 + 5 x 1 - 5 x 8/ 5 x 1
= 5 x ( 107+1-8)/ 5 x 1
= 5 x 100/5 x 1
= 1 x 100/ 5 x 1
= 100
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a: 34/56=17/28=1-11/28
42/53=1-11/53
mà 11/28>11/53
nên 34/56<42/53
b: 5/4=15/12; 7/6=14/12; 5/6=10/12
=>5/4>7/6>5/6
c: 4/3>1>99/100
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Đúng ghi Đ, sai ghi S vào ô trống:
a) 5 × 113 - 5 × 13 = 5 × (113 – 13) = 5 × 100 = 50 S
b) 5 × 113 - 5 × 13 = 5 × (113 – 13) = 5 × 100 = 500 Đ
c) 5 × 113 - 5 × 13 = 5 × (113 – 13) × 5 = 5 × 100 × 5 = 2500 S
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\(\frac{1}{5}+\frac{1}{7}+\frac{1}{3}+\frac{100}{125}+\frac{66}{77}+\frac{40}{60}\)
\(=\frac{1}{5}+\frac{1}{7}+\frac{1}{3}+\frac{4}{5}+\frac{6}{7}+\frac{2}{3}\)
\(=\left(\frac{1}{5}+\frac{4}{5}\right)+\left(\frac{1}{7}+\frac{6}{7}\right)+\left(\frac{1}{3}+\frac{2}{3}\right)\)
\(=1+1+1\)
\(=3\)
2010 -5-5-5-..-5
= 2010-5x100
= 2010 -500
= 1510
= 2010 - (5+5+5+....+5) (100 số 5)
= 2010 - 100 . 5 = 2010 - 500 = 1610