《专项计算练习》由会员分享，可在线阅读，更多相关《专项计算练习（4页珍藏版）》请在金锄头文库上搜索。
1、计算练习计算练习 一、计算下面各题，能用简便方法的要用简便方法算。一、计算下面各题，能用简便方法的要用简便方法算。253.2125253.2125 (1(1 )2 2 7 71 14 4 1 15 532.63332.63332.62332.623 2.5(3.522.22.5(3.522.20.02)0.02) 77 ( ( + + )1 16 6 2 27 71 1 7 71 11 1 2 27 71 14 4 1 15 54 4 5 52 2 3 31 10 0 1 11 1729.9729.9 5 5 9 91 1 6 65 5 1 18 8 4.5(13.54.5(13.510.51
2、.5)10.51.5)5 5 1 18 85 5 1 12 23 3 8 87 7 1 12 246.70.1846.70.1846.70.8246.70.82 ( ) )1 1 1 12 22 2 3 31 1 2 23 3 8 80.75(4.80.12)0.75(4.80.12) 5 5 8 81 15 5 1 16 64 4 9 936(36( ) ) ( ( )()( ) )1 1 4 45 5 6 67 7 9 95 5 6 63 3 4 42 2 3 34 4 9 9( ( )7)7 2020 ( ) )5 5 7 71 1 1 15 58 8 1 15 54 4 7 71 1
3、2 23 3 8 83.7993.799 3 3 4 41 1 6 63 3 8 821.3521.350.640.6411.6511.650.360.36 (7.9(7.93.060.68)1.53.060.68)1.5( ( )24)24 ( ) )5 5 6 65 5 8 81 1 1 12 24 4 5 53 3 4 42 2 5 57 7 1 15 54545 10.110.1 3 3 8 81 1 3 31 1 4 40.750.75 0.3750.375 3.313.3118.3470.518.3470.55 5 8 81 1 4 484.6784.67(14.67(14.671
4、5.3)15.3) ( ) )1 1 5 51 1 3 31 1 2 25 5 6 618.3470.518.3470.5 4 4 2 25 53 3 4 41 1 5 50 0二、解方程二、解方程3X3X3.63.6 = = 2.12.1 X X X=18X=18 X X X=42X=421 1 5 52 2 3 31 1 2 23X3X1.25=91.25=9 3X3X48=10248=102 X X X=2X=23 3 4 41 1 2 2X X X=38X=38 36X8=936X8=9 4 45X=85X=83 3 4 41 1 5 5(X(X5)45)4 = = 8.58.5 14
5、(X14(X2)=1962)=196 (X(X12)612)6 = = 1081086X6X2929 =15=15 2.8X2.8X7.27.2 = = 19.819.8 5.4X5.4X = = 8.18.11.831.833X=33X=3 3X3X1.4X=41.4X=4 59.659.68X=3.68X=3.6 三、解比例三、解比例X:X: = = 60:560:5 :X:X = = 3:3: 3:X3:X = = : :2 2 3 35 5 6 61 1 1 10 05 5 6 62 2 9 9:X:X = = :2:2 : : = = X:X: = = 2 2 3 31 1 6 62 2 3 35 5 9 91 1 1 12 22 2. .7 7 3 3 x6 . 310:X10:X = = : : 0.6:X0.6:X = = :2:2 = = 2 2 3 34 4 5 51 1 3 32 22 2. .5 5 4 4 6X:X:X = = : : = = X:X: = = 2.4:2.4:4 4 5 56 6 7 75 5 8 8 2x 25. 175. 02 2 3 31 1 1 10 0: : = = X:30X:30 6.5:X6.5:X = = 3.25:43.25:4 : : = = X:9X:94 4 5 51 1 6 62 2 3 35 5 6 6
