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219,1 + y:y < y \(\times\) 2 + y \(\times\) 4 - y < 230,2 - y + y
219,1 + 1 < y \(\times\) 2 + y \(\times\) 4 - y \(\times\) 1 < 230,2 - ( y - y)
210,1 < y \(\times\) ( 2 + 4 - 1) < 230,2
210,1 < y \(\times\) 5 < 230,2
210,1 : 5 < y < 230,2: 5
42,02 < y < 46,04
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y:8+yx8-56,78=138,22
y:8+yx8 =138,22-56,78
y:8+yx8 =81,44
yx8,125 =81,44
y =81,44:8,125
y =10,02...
y : 8 + y \(\times\) 8 - 56,78 = 69,11 \(\times\) 2
y \(\times\) 0,125 + y \(\times\) 8 - 56,78 = 138,22
y \(\times\) ( 0,125 + 8) = 138,22 + 56,78
y \(\times\) 8,125 = 195
y = 195 : 8,125
y = 24
Thử lại ta có:
24 : 8 + 24 \(\times\) 8 - 56,78
= 3 + 192 - 56,78
= 195 - 56,78
= 138,22
= 69,11 \(\times\) 2
Vậy y = 24 là đúng
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y x (4+6+8+2)= 200
y x 20 =200
y = 200 : 20
y= 10