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56,28 x 93,26 - 56,28 x 85,26 + 56,28 : 1/2 + 56,28
= 56,28 x 93,26 - 56,28 x 85,26 + 56,28 x 0,5 + 56,28
= 56,28 x ( 93,26 - 85,26 + 0,5 + 1 )
= 56,28 x 9,5
= 534,66
a; 100% : \(x\) - 50% : \(x\) + 40% : \(x\) = 18 + 30% : \(x\)
(100% - 50% + 40%): \(x\) = 18 + 30% : \(x\)
90% : \(x\) = 18 + 30% : \(x\)
90%: \(x\) - 30%: \(x\) = 18
60% : \(x\) = 18
\(x\) = 60% : 18
\(x\) = \(\dfrac{1}{30}\)
y + y : 0.5 + y : 0.25 + y:0.125 = 15
y x 1 + y x 2 + y x 4 + y x 8 = 15
y x (1+2+4+8) = 15
y x 15 = 15
y = 15 : 15
y = 1
y + y : 0,5 + y : 0,25 + y : 0,125 = 15
y x 1 + y x 2 + y x 4 + y x 8 = 15
y x ( 1 + 2 + 4 + 8 ) = 15
y x 15 = 15
y = 15 : 15 = 1
y+y:0.5+y:0.25+y:0.125=15
yx1+yx2+yx4+yx8=15
yx(1+2+4+8)=15
yx15=15
y=15:15
y=1
= y + 4 + y + 6 + y + 8 + ... + y + 26 = 210
=> (y + y + y+ ... + y) + (4 + 6 + 8 + ... + 26) = 210
=> 12y + 180 = 210
12y = 210 -180
12y = 30
y = 30 : 12
y = 2.5
Đáp số : 2.5
=> (y+y+y+...+y)+(1+4+7+...+28)=155
xet tong 1+4+7+...+28 co: (28-1) /3+1=10 ( so hang) => co 10 so hang y
=> 1+4+7+..+28=(1+28)*10/2=145
=) (y+1)+(y+4)+(y+7)+...+(y+28)=155
=>10y + 145=155
10y=155-145
10y=10
=> y=1
MIH CHAC CHAN DO, duyet DUNG nha
\(y-125,89-85,26=482,86+146,58\)
\(y=629,44+125,89+85,26\)
\(y=840,59\)
vậy \(y=840,59\)
\(y-125,89-85,26=482,86+146,58.\)
\(y-125,89-85,26=629,44\)
\(y-125,89=629,44+85,26\)
\(y-125,89=714,7\)
\(y=714,7+125,89\)
\(y=840,59\)