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32 - 15 + 8 - 5 + 20
= ( 32 + 8 ) + ( 15 + 5 ) + 20
= 40 + 20 + 20
=80
32 - 15 + 8 - 5 +20
= ( 32 + 8 ) + ( 15 + 5 ) + 20
= 40 + 20 +20
= 80
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a)75*2014+2015*24+1990=75*2015-75+2015*24+2015-25=2015*(75+24+1)-100=2015*100-100=201500-100=201400
b)Số các số hạng là:(310-5):5+1=62
Ta có:5+10+15+20+.......+300+305+310=(5+310)+(10+305)+...+(15+300)=315*62=19530
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1) \(\frac{1}{5}+\frac{3}{17}-\frac{4}{3}+\left(\frac{4}{5}-\frac{3}{17}+\frac{1}{15}\right)\)
\(=\frac{1}{5}+\frac{3}{17}-\frac{4}{3}+\frac{4}{5}-\frac{3}{17}+\frac{1}{15}\)
\(=\left(\frac{1}{5}+\frac{4}{5}\right)+\left(\frac{3}{17}-\frac{3}{17}\right)-\left(\frac{4}{3}-\frac{1}{15}\right)\)
\(=1+0-\frac{19}{15}\)
\(=-\frac{14}{15}\)
\(1035\div15+1365\div15=\left(1035+1365\right)\div15\)
\(=2400\div15=160\)
Đây không phải Toán 1 nha!
1035:15+1365:15
=(1035+1365):15
=2400:15
=160