1、五年级数学简便计算题及答案3.29+0.73+2.273.29-0.73-2.277.5+2.5-7.5+2.57.325-3.29-3.3257.325-(5.325+1.7)3.29+0.73-2.29+2.273.290.2540.1258.80.250.280.1253.22.53510.20.2540.2543.5101-3.53.59.9+3.50.13.52.7+350.733.52.7-3.50.7(32+5.6)0.83.50.6-0.50.64.91.470.25470.1257.35(7.350.25)7.35(7.350.25)3.070.381.621.293.72.
2、716.382.451.553.251.790.591.7523.40.813.47.20.324033.20.364.81.641.233.40.236.60.253612.7(3.70.84)36.541.764.540.250.7347.60.80.27.60.851990.258.541.288.60.728.612.50.960.810.49.60.350.8(4.31.25)3.123.129928.610128.6(4.236.17)0.80.8615.70.8614.72.4102147.322.682.648.677.3611.33答案3.290.732.27 3.290.7
3、32.27 7.52.57.52.5 =3.29(0.732.27) =3.29(0.732.27) =(7.57.5)(2.52.5) =3.293 =3.293 =05 =6.29 =0.29 =5 (加法结合律) (减法的性质) (同级运算交换) 7.3253.293.325 7.325(5.3251.7) =7.3253.3253.29 =7.3255.3251.7 =43.29 =21.7 =0.71 =0.3 ( 减 法 交 换 ) ( 减 法 的 性 质 ) 3.290.732.292.27 3.290.254 0.1258.8 =(3.292.29)(0.732.27) =3.
4、29(0.254) =0.12581.1 =13 =3.291 =11.1 =4 =3.29 =1.1 (同级运算交换) (乘法结合律) (先拆数,乘法结合律) 0.250.28 0.1253.22.5 3510.2 =0.2540.07 =(0.1258)(0.42.5) =35(100.2) =10.07 =11 =3510350.2 =0.07 =1 =3507 (先拆数,乘法结合律) (拆数,乘法结合律) =357 (拆数,乘法分配律) 0.2540.254 =(0.250.25)(44) =116 =16 (同级运算交换) 3.51013.5 3.59.93.50.1 3.52.73
5、50.73 =3.5(1011) =3.5(9.90.1) =3.52.73.57.3 =3.5100 =3.510 =3.5(2.77.3) =350 =35 =3.510 (乘法分配律) (乘法分配律) =35 (先利用积不变的规律转化, 然后再用乘法分配律) 3.52.73.50.7 (325.6)0.8 3.50.60.50.6 =3.5(2.70.7) =320.85.60.8 =(3.50.5)0.6 =3.52 =407 =30.6 =7 =47 =5 (乘法分配律) (后 2 题类似分配律,但只适用于(ab)c 和(ab)c,而 a(bc)和 a(bc)不能用。) 4.91.4
6、 70.254 70.125 =4.9(70.2) =7(0.254) =78 =4.970.2 =71 =56 =0.70.2 =7 ( 乘 除 法 转 化 规 律 , 转 化 时 =3.5 符 号 相 反 , 转 化 前 后 的 2 数 (拆数,除法的性质) (除法的性质) 相乘得 1。) 7.35(7.350.25) 7.35(7.350.25) =7.357.350.25 =7.357.350.25 =10.25 =10.25 =4 =0.25 (除法的性质) (前面是除号,脱括号符号相反) 3.070.381.62 1.293.72.716.3 82.451.55 =3.07(0.3
7、81.62) =(1.292.71)(3.76.3) =8(2.451.55) =3.072 =410 =84 =1.07 =14 =4 (减法的性质) (加法交换律和加法结合律) (减法的性质) 3.251.790.591.75 23.40.813.47.2 0.32403 =(3.251.75)(1.790.59) =(23.413.4)0.87.2 =0.32(400+3) =51.2 =10(0.87.2) =0.324000.323 =6.2 =108 =1280.96 ( 同 级 运 算 交 换 ) =2 =128.96 (减法交换和减法的性质) (拆数,乘法分配律) 3.20.3
8、64.81.64 1.233.40.236.6 0.2536 =(3.24.8)(0.361.64) =(1.230.23)(3.46.6) =0.2549 =82 =110 =19 =10 =11 =9 (加法交换律和加法结合律) (同级运算交换) (拆数,乘法结合律) 12.7(3.70.84) 36.541.764.54 0.250.734 =12.73.70.84 =36.544.54 1.76 =0.2540.73 =90.84 =321.76 =10.73 =8.14 =30.24 =0.73 (减法的性质) (减法交换) (乘法交换律和乘法结合律) 7.60.80.27.6 0.
9、85199 0.258.54 =7.6(0.80.2) =0.85(2001) =0.2548.5 =7.61 =0.852000.851 =18.5 =7.6 =170-0.85 =8.5 (乘法分配律) =169.15 (乘法交换律和乘法分配律) (拆数,乘法分配律) 1.288.60.728.6 12.50.960.8 10.49.60.35 =(1.280.72)8.6 =12.50.80.96 =10.43.36 =28.6 =100.96 =7.04 =17.2 =9.6 ( 无 简 算 ) (乘法分配律) (乘法交换律和乘法结合律) 0.8(4.31.25) 3.123.1299
10、 28.610128.6 =0.81.254.3 =3.12(199) =28.6(1011) =11.25 =3.12100 =28.6100 =1.25 =312 =2860 (乘法交换律和乘法结合律) (乘法分配律) (乘法分配律) (4.236.17)0.8 0.8615.70.8614.7 2.4102 =10.40.8 =0.86(15.714.7) = 2.4(1002) =8.32 =0.861 =2.41002.42 ( 无 简 算 ) =0.86 =2404.8 ( 乘 法 分 配 律 ) =244.8 (拆数,乘法分配律) 147.322.68 2.648.677.3611.33 =14(7.322.68) =(2.647.36)(8.6711.33) =1410 =1020 =4 =30 (减法的性质) (加法交换律和加法结合律)