Do każdego iloczynu dobierz iloczyn mu równy! szybko?! 25 ∙ 0,4 0,25 ∙2 0,7² · 10 1,5 ∙ 0,5 0,3 ∙ 4 I. 1 2/3 ∙ 3/10 II. 2 1/2 ∙ 3/10 III. 1 3/7 ∙ 7 IV. 21/40 ∙ 9 1/3 Pomocy z góry dzięki :)
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25 ∙ 0,4= 10 ------ III. 1 3/7 ∙ 7 = 10/7 * 7 = 10
0,25 ∙2 = 0,50 = 1/2 ---- I. 1 2/3 ∙ 3/10= 5/3 * 3/10 = 5/10 = 1/2
0,7² · 10 = 0,49 * 10 = 4,9 ---- IV. 21/40 ∙ 9 1/3 = 21/40 * 28/3 = 49/10 = 4,9
1,5 ∙ 0,5 = 0,75 = 3/4 ---- II. 2 1/2 ∙ 3/10= 5/2 * 3/10 = 15/20 = 3/4
0,3 ∙ 4 = 1,2
I. 1i2/3 *3/10 =5/3 *3/10= 1/1 * 1/2 = 1/2
0,25 * 2 = 0,5 ( 1/2 = 0,5)
II. 2i1/2 * 3/10= 5/2 * 3/10= 1/2 * 3/2 = 3/4
1,5 * 0,5 = 0,75 ( 3/4 = 0,75 )
III. 1i3/7 * 7= 10/7 * 7 = 10/1 * 1 = 10
25 * 0,4 = 10
IV. 21/40 * 9i1/3 = 21/40 * 28/3 = 7/10 * 7/1 = 49/10 = 4i9/10
0,7^2 *10 = 0,49 * 10 = 4,9 ( 4i9/10 = 4,9)