Students book p.76. ex. 2 Write true or false sentences. Correct the false sentences

Question

Математика: Students book p.76. ex. 2 Write true or false sentences. Correct the false sentences

Vinri · Accepted Answer

б) 2,5•13,57 + 26,43•2,5=100
2,5*13,57=33,925
26,43*2,5=66,075
33,925+66,075=100

в) 208,6 – 3,612 : ( 0,015 + 0,075•5,4 ) =200
0,075*5,4=0,405
0,015+0,405=0,42
3,612:0,42=8,6
208,6-8,6=200

Уравнение

а) (4,479 – 3х) : 0,06 + 6,4 = 80
(4,479 – 3х) : 0,06 =80-6,4
(4,479 – 3х) : 0,06 =73,6
4,479-3х=73,6*0,06
4,479-3х=4,416
3х=4,479-4,416
3х=0,063
х=0,063 :3
х=0,021

б) (72 – 8х)•16 + 15 = 15
(72 – 8х)•16 =15-15
(72 – 8х)•16 =0
72-8х=0:16
72-8х=0
8х=72-0
8х=72
х=72:8
х=9

в) (5,3х + 6,9х – 4,3х – 86,9) (4х – х + 5х – 976) = 0
(5,3х + 6,9х – 4,3х – 86,9)=0
7,9х-86,9=0
7,9х=86,9
х=86,9 :7,9
х=11

(4х – х + 5х – 976) = 0
8х-976=0
8х=976
х=976:8
х=122

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