19*2*5
2*5=10, 19*10=190
4*27*25
4*25=100, 27*100=700
13*6*50
6*50=300, 13*3*100=3900
Ответ:
2/5; 2,2/5; 1/4; 1,1/4; 3/4; 1/2; 5/2
(X-7):0,2=15:4
(X-7);0,2=3,75
(X-7)=3,75•0,2
X-7=0,75
X=0,75+7
X=7,75
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(7,75-7):0,2=3,75
3,75=3,75
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x : 8\5 = 23\7 : 92\35
5x\8=5\4
5x=5*8\4
5x=10
x=2
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