# wQN Q A

#### QDA̗p

yPzA𗘗p͑̉@̎菇
m̒lQ܂ޕ͑AA𗘗pĉĂ܂B
͑l菇́AP͑̂̕ƂƓłB

①悭ǂ݁A킩Ȃʂ$x$  C$y$  ȂǂƂB
②ʂ̊֌W݂āAB
③B
④̉ɓKĂ邩m߂B

yQz̖
kl
Q̎Rm܂Bm̏\̈ʂ̐ƈ̈ʂ̘̐a͂PRŁAm̏\̈ʂ̐ƈ̈ʂ̐ꂩĂł鎩ŔAmQV傫łBRm߂܂傤B

k𓚁l
m̏\̈ʂ̐$x$  C̈ʂ̐$y$  Ƃ܂B
m̏\̈ʂ̐ƈ̈ʂ̘̐a͂PRȂ̂ŁA
$x+y=13$  ……①

܂Am$10x+y$  ƕ\ƂłAm̏\̈ʂ̐ƈ̈ʂ̐ꂩĂłŔA$10y+x$  ƕ\Ƃł܂B
̒lmQV傫̂ŁA
$10y+x=\left( 10x+y \right)+27$
$9y=9x+27$
$y=x+3$  ……②

②①ɑ
$x+\left( x+3 \right)=13$
$2x=10$
$x=5$  ……③
③②ɑ
$y=5+3=8$

ijTW

yRzƑ̖
kl
PPWO~̃RƂPPTO~̃ACXA킹ĂPTɂXɍs܂BƂ낪ARƃACX̌ႦĂ܂A\̋zXO~ȂĂ܂܂BŏRƃACXꂼꉽƂĂ܂B

k𓚁l
ŏɔƂĂR$x$ A ACX$y$ Ƃ܂B
$x+y=15$  ……①
$180y+150x=\left( 180x+150y \right)+90$  ……②

$-30x+30y90$  ……③
③30Ŋ
$-x+y=3$  ……④
①④
$x+\left( 3+x \right)=15$
$2x=12$
$x=6$  ……⑤
⑤①
$6+y=15$
$y=9$

ijRUCACXX

ySẑEԁE̖
kl
n_PUꂽbn_܂ōŝɁAr̂an_܂ł͎RŕAan_bn_܂ł͎SŕƂASԂRO܂Bn_an_܂ł̓̂ƁAan_bn_܂ł̓̂ꂼꋁ߂܂傤B

k𓚁l
a̓̂$x$ kmA ab̓̂$y$ kmƂ
$x+y=16$  ……①
$\dfrac {x} {3} +\dfrac {y} {4} =4+\dfrac {30} {60}$  ……②

$4x+3y=54$  ……③
③|①~R
$x=6$  ……④
①④
$y=10$

ij`a̓̂͂UCab̓̂͂PO

yTz̖
kl
W̐HƂPT̐H킹āAPO̐HVOO܂BQނ̐HAꂼꉽ킹΂ł傤B

k𓚁l
W̐H$x$ APT̐H$y$ Ƃ
$x+y=700$  ……①
$\dfrac {8} {100} x+\dfrac {15} {100} y=700\times \dfrac {10} {100}$  ……②

$8x+15y=7000$  ……③
①③ɑ
$8x+15\left( 700-x \right)=7000$
$8x+10500-15x=7000$
$7x=3500$
$x=500$  ……④
④①ɑ
$500+y=700$
$y=200$

ijW̐HTOOC PT̐HQOO