Question

5．兩筐蘋(píng)果共重100千克，現(xiàn)取出甲筐蘋(píng)果的$\frac{1}{5}$和乙筐蘋(píng)果的$\frac{1}{4}$共22千克分給小朋友，甲筐原來(lái)有蘋(píng)果多少千克？

Answer 1

分析 此題列方程解答比較容易，設(shè)甲筐蘋(píng)果為x千克，乙筐蘋(píng)果為（100-x）千克，根據(jù)題意：甲筐蘋(píng)果的$\frac{1}{5}$+乙筐蘋(píng)果的$\frac{1}{4}$=22千克，列并解方程即可．

解答 解：設(shè)甲筐蘋(píng)果為x千克，乙筐蘋(píng)果為（100-x）千克，
$\frac{1}{5}$x+$\frac{1}{4}$×（100-x）=22
          $\frac{1}{5}$x+25-$\frac{1}{4}$x=22
                    $\frac{1}{20}$x=3
                         x=60，
答：甲筐原來(lái)有蘋(píng)果60千克．

點(diǎn)評(píng) 含有兩個(gè)未知數(shù)的應(yīng)用題列方程解答比較容易，關(guān)鍵是找準(zhǔn)題里的等量關(guān)系．