1020+30000=?
[(1+2019/1)+(1+2019/2)+...+(1+2019/1020)]:[(1+1020/1)(1+1020/2)+....+(1+1020/2019)]
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1020+X.1/3=4/5+1020
\(1020+Xx\frac{1}{3}=\frac{4}{5}+1020\)
\(=1020+Xx\frac{1}{3}=\frac{5104}{5}\)
\(=Xx\frac{1}{3}=\frac{5104}{5}-1020\)
\(=Xx\frac{1}{3}=\frac{4}{5}\)
\(=\frac{4}{5}:\frac{1}{3}\)
\(=\frac{12}{5}\)
\(1020+x.\frac{1}{3}=\frac{4}{5}+1020\)
\(1020+x.\frac{1}{3}=\frac{5104}{5}\)
\(x.\frac{1}{3}=\frac{5104}{5}-1020\)
\(x.\frac{1}{3}=\frac{4}{5}\)
\(x=\frac{4}{5}:\frac{1}{3}\)
\(x=\frac{12}{5}\)
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\(1020+x\cdot\frac{1}{3}=\frac{4}{5}+1020\)
\(1020+x\cdot\frac{1}{3}=\frac{5104}{5}\)
\(x\cdot\frac{1}{3}=\frac{5104}{5}-1020\)
\(x\cdot\frac{1}{3}=\frac{4}{5}\)
\(x=\frac{4}{5}\div\frac{1}{3}\)
\(x=\frac{12}{5}\)
So sánh
A=1020+9/1020-6
B=1021+5/1021+5
Tính nhẩm
30000 + 40000 – 50000 =
80000 – (20000 + 30000 ) =
80000 – 20000 – 30000 =
30000 + 40000 – 50000 = 20000
(nhẩm : 3 chục + 4 chục – 5 chục = 2 chục nghìn )
80000 – (20000 + 30000 ) = 30000
80000 – 20000 – 30000 = 30000
Tính nhẩm:
a) 30000 + (20000 + 40000) = ..................
30000 + 20000 + 40000 = ..................
60000 - (30000 + 20000) = ..................
60000 - 30000 - 20000 = ..................
b) 40000 x 2 : 4 = ..................
36000 : 6 x 3 = ..................
20000 x 4 : 8 = ..................
60000 : 3 x 2 = ..................
a) 30000 + (20000 + 40000) = 90000
30000 + 20000 + 40000 = 90000
60000 - (30000 + 20000) = 10000
60000 - 30000 - 20000 = 10000
b) 40000 x 2 : 4 = 20000
36000 : 6 x 3 = 18000
20000 x 4 : 8 = 10000
60000 : 3 x 2 = 18000
10000000000*0*2+3-30000-30000
10000000000 x 0 x 2 + 3 - 30000 - 30000
= 0 x 2 + 3 - 30000 - 30000
= 3 - 30000 - 30000
= (-29997) - 30000
= (-59997)
Tính nhẩm:
a) 50000 + 20000 + 10000 = ............
80000 - (30000 + 20000) = ............
b) 80000 - 30000 - 20000 = ............
50000 + (20000 + 10000) = ............
a) 50000 + 20000 + 10000 = 80000
80000 - (30000 + 20000) = 30000
b) 80000 - 30000 - 20000 = 30000
50000 + (20000 + 10000) = 80000
<, >, = ?
27469…27470
70000 + 30000 …99000
85100…85099
80000 + 10000..99000
30000…29000+ 1000
90000 + 9000..99000
27469 < 27470
70000 + 30000 > 99000
85100 > 85099
80000 + 10000 < 99000
30000 = 29000 + 1000
90000 + 9000 = 99000
a)1020+X.1/3=4/5+1020
b) X:2/3=25/1/2
c)5/4/9+X-7/7/18=15/3/4