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1、五年级数学（下）解方程练习（1）班级姓名1加数+加数=和加数=和-另一个加数例：20+x =45 （x是一个加数，应用：加数=和-另一个加数 方法来解）解：x =45-20x =2560+ x =160.52.04+x =35.2 x +25=38x +2.5=3.8x +3.2=15x +52=100x +0.64=64x +17=35.7x +0.25=1x +14=23.4x +0.64=64.64x +12.72=35.7练习20题：35+ x =10012.5+ x =4547+ x =3053.5+ x =30.54.6+ x =274.4+ x =1002.3+ x =3014+
2、 x =30.52、被减数-减数=差被减数=差+减数减数=被减数-差例：x-5仁43 （x是一个被减数，应用：被减数二差+减数方法来解）解：x =43+51x =94例：64- x =20（x是一个减数，应用：减数二被减数-差方法来解）解：x =64-20x =44练习20题：x -5仁68x -12.5=5x -14.25=43x -3.52=2.48x 12.5=6.8x -3.14=1.86x -2.33=5.65x -40=6094- x =2042.32- x =300.64- x =0.25100- x =0.25x -7.24=4.3x -12=5.680- x =701.5-x
3、 =0.259.4- x =2.4100.5- x =0.50.64- x =0.2510- x =0.553、因数X因数=积 因数=积+另一个因数例：6x =48 （x是一个因数，应用：因数=积+另一个因数 方法来解）解：x =48 6x =8练习10题：7 x =630.32 x =1600. 6 x =4.8625 x =1008x =720.25 x =4002.25 x =90025 x =15 x =0.458x =10005x =1.514x =701.6 x =6.423x =9230x =153x =1.0812x =9618x =3.640x =9600.9x =2.434
4、、被除数宁除数二商被除数=商X除数除数=被除数商例：x 9=53 (x是一个被除数,应用：被除数=商x除数方法来解）解：x =53x 9x=477例：255x =5 （x是一个除数,应用：除数=被除数+商方法来解）5五年级数学（下）解方程练习（1）班级姓名#五年级数学（下）解方程练习（1）班级姓名解：x =255 5x =51练习20题:x- 12=13x- 0.9=5.3x- 0.25=2.14x- 3.2=17x 1.2=1.3x 4.9=5.8x 7.22=3.1x 0.25=43005 x =52.55 x =0.532.8 x =0.21000x =83612x =33245x =5
5、4812x =21000x =25x 8=125x 4=254.68 x =0.4100x =4#五年级数学（下）解方程练习（5）班级姓名5、稍复杂的方程（一）例：2 x -20=4 （先把2 x看成一个整体，2 x看成一个被减数， 应用：被减数=差+减数方法来解）（最关键是把含有x的量看成一个 整体，还把它看成一个什么数）2x -20 = 4 解： 2x= 4+20 2x= 24x= 24 宁 2x = 12练习30题：2x -5仁67 4x -3.52=12.4880-10 x =700.5 x -7.24=4.32X1.02+x =35.24.6+3 x =272 X7+2x =3030
6、X2+5 x =160.521 x+ 8=12592-8 x =200.64-3 x =0.25100-5 x =0.2535+5 x =10012.4+4 x =453.5+9 x =30.56#8x+ 3.2=173005 -2x =52.55 -3x =0.532.8 -4x =0.4#五年级数学（下）解方程练习（6）班级姓名(x -3 ) - 2=7.53 (x +2.1 ) =10.55 (x +20) =107.513 (x +5) =169(x -3 ) - 6=6.32+(x -2.6 ) =85+ (x +1.5 ) =17.5(x -6.2 ) -8=41.6(x -3)
7、2=7.56、稍复杂的方程（二）例：（2.8+ x） X 2=10.4 （先把（2.8+ x）看成一个整体，（2.8+ x）看成一个因数，首先应用：因数=积+另一个因数 方法来解（最关键是把 括号看成一个整体，还把它看成一个什么数）(2.8+x ) X2=10.4解:2.8+x =10.4 宁 22.8+x =5.2x =5.2-2.8x =2.4练习20题：2 (x -2.6 )=85(x +1.5 ) =17.58(x -6.2 ) =41.6(X -20 ) - 6=50(x -15 ) - 7= 602(x -2.6 ) =195 (x +1.5) =1150.8 (x -6.2 )
8、=41.6(x -3 ) - 0.2=7.5五年级数学（下）解方程练习（7）班级姓名7、稍复杂的方程（三）例：x +2.4 x =5.1 （先把含有x的量相加或相减，最后解方程）解：（1+2.4） x =5.13.4 x =5.1x =5.1 - 3.4x =1.5练习16题：9#13.2 x +9x =33.38 x 5 x =105x 0.36 x =16 x +5 x =54x +9x =33.35.4 x + x =12.85.4 x + x +5.4 x =11.8#1025 x 6 x =38012 x 9 x =8.714 x 6 x =640#42 x +25 x =13432 x + x =1654.8(1.2 x +1.3 x) =24#1 + x +1.5 x =10.24+ (2x +3x) =24 x +3x +26=15211