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1 pe4 +5pe7=,3pe5-3pe7=,2pe9-1pe6=,7pe11×3pe4=,5pe18×7pe10=

Răspuns :

Răspuns:

Explicație pas cu pas:

1/4 + 5/7 = 7/28 + 20/28 = 27/28

3/5 - 3/7 = 21/35 - 15/35 = 6/35

2/9 - 1/6 = 4/18 - 3/18 = 1/18

7/11 x 3/4 = 21/44

5/18 x 7/10 = 35/180 = 7/36

1/4+5/7=

=7/28+20/28=27/28

3/5-3/7=

=21/35-15/35=6/35

2/9-1/6=

=4/18-3/18=1/18

7/11×3/4=21/44

5/18×7/10=

=1/18×7/2=7/36