5995

5295

a)300 + 5 + 0,14

= 305 + 0,14

= 305,14

b) 45 + 0,9 + 0,008

= 45,9 + 0,008

= 45,908

Học sinh nhẩm và ghi kết quả như sau:

a) 400 + 300 = 700

700 – 300 = 400

700 – 400 = 300

b) 500 + 40 = 540

540 – 40 = 500

540 – 500 = 40

c) 100 + 20 + 4 = 124

300 + 60 + 7 = 367

800 + 10 + 5 = 815

a) 400 + 300 = 700 

700 – 300 = 400

700 – 400 = 300

b) 500 + 40 =540

540 – 40 =500

540 – 500 =40

c) 100 + 20 + 4 =124

300 + 60 + 7 =367

800 + 10 + 5 =815

C,\(230+4+\frac{3}{10}+\frac{7}{100}\)

\(=230+4+0,3+0,07\)

\(=234+0,3+0,07\)

\(=234,3+0,07\)

\(=234,37\)

D,\(500+7+\frac{9}{1000}\)

\(=500+7+0,009\)

\(=507+0,009\)

\(=507,009\)

Bai 2

C1 ( 2,04 + 3,4 ) : 0,68

= 5,44 : 0,68

=  8

C2 ( 2,04 + 3,4 ) : 0,68

= 2,04 : 0,68 + 3,4 : 0,68

= 3 + 5

= 8

c)234+\(\frac{3}{10}\)+\(\frac{7}{100}\)

=234+0,3+0,07

=234,37

d)507+\(\frac{9}{1000}\)

=507+0,009

=507,009

bài 2:

c1:(2,04+3,4):0,68

=5,44:0,68

=8

c2:(2,34+3,4):0,68

=2,34:0,68+3,4:0,68

=3+5

=8
 

a) 2 x 2 = 4              3 x 3 = 9

2 x 4 = 8              3 x 5 = 15

2 x 6 = 12              3 x 7 = 21

2 x 8 = 16              3 x 9 = 27

4 x 4 = 16              5 x 5 = 25

4 x 2 = 8              5 x 7 = 35

4 x 6 = 24              5 x 9 = 45

4 x 8 = 32              5 x 3 = 15

b) 200 x 4 = 800              300 x 2 = 600

200 x 2 = 400             300 x 3 = 900

400 x 2 = 800             500 x 1 = 500

100 x 4 = 400             100 x 3 = 300

Trả lời 1 câu thôi nhé em 100 nhân 4 bằng 400 nhá em

\(a,\frac{5}{7}+\frac{7}{13}+\frac{19}{13}+\frac{6}{5}+\frac{9}{7}+\frac{9}{5}.\)

\(=\left(\frac{5}{7}+\frac{9}{7}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{6}{5}+\frac{9}{5}\right)\)

\(=\frac{14}{7}+\frac{26}{13}+\frac{15}{5}=2+2+3=7\)

\(b,\frac{1}{10}+\frac{20}{100}+\frac{300}{1000}+\frac{4000}{10000}\)

\(=\frac{1}{10}+\frac{2}{10}+\frac{3}{10}+\frac{4}{10}=\frac{1+2+3+4}{10}=\frac{10}{10}=1\)

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