(5/8 - 3/16): 2 + 1 решите по действиям (7/20 + 2/5) * 3 решите уравнение: 13x + 15x - 24=60

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Ответы и объяснения

2013-01-20T11:00:10+00:00
(5/8-3/16) : 2+1 1)5/8-3/16=10/16-3/16=7/16 ; 2)7/16 : 2=7/32 ; 3)7/32+1=39/32=1(целая)7/32 (7/20+2/5)*3 1)7/20+2/5=15/20=3/4 ; 2)3/4*3=9/4=2(целых)1/4 ; 13x+15x-24=60 ; 28x=36 ; X=36/28=9/7=1(целая)2/7
2013-01-20T11:16:33+00:00

(5/8 - 3/16): 2 + 1=

 

    5*2-3*1        1                10-3        1                   7

= ------------ * ------- +1 = ----------*--------+1 = -------+1 - 1 i 7/32

        16              2                  16          2                32

 

 

                                                                          7*1+2*4                 7+8                15*3          45

решите по действиям (7/20 + 2/5) * 3= ----------------*3 = -----------*3 = ------------ =----------- =

                                                                              20                         20                    20           20

=2 i 5/20 = 2 i 1/4

 

 

 

решите уравнение: 13x + 15x - 24=60

                                            28x-24 = 60

                                            28x = 60+24

                                             28x = 84

                                              x = 84:28

                                              x = 3

                               ------------------------------------

                

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