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1、计算题1、(得数保存一位小数)(1)0.380.23(2)5.793.6(3)4.60.25(4)624(5)52.9575(6)3.017(7)4.9511(8)84.0131(9)0.64619(IO)4.70.592、(除不尽的保存两位小数)(11)31.2(15)415(19)5677(23)2333(12)2.70.36(16)91.20.57(20)1.474.2(24)7.410.57(13)88.41.7(17)84.841.2(21)19.190.95(25)21240(27)3.850.76(28)53.34.7(29)56.296.1(14)7.5250.38(18)5.
2、636.1(22)56.296.1(26)9.6816(30)28.7431(33) 30.1 33(37) 67.811(34) 1715(38) 873、得数用循环小数表示。(31)0.20.06(32)1311(35) 7.82.2(36)5.529二、能简便计算的要简便计算(39)2.53.60.9(40)12.50.38.8(41)1.25(100-8)(44) 8.4-8.41.51.8(47)2.41.250.3(53) 3.51.02+350.098(42)42(5.250.25)(43)0.4+12.60.280.2(45)12.54.5+4.512.5+12.5(46)1.
3、298(48) (20-0.89)X5.7(49)0.8x133.12+5.28(49) (50)118-(11.4-12.50.8)(51)50(6.70.02)(52)0.25+2.5+25)0.4(54)0.2799+0.27(55)2.53.20.125(56)13.52,50.1250.48(57)2.614.5+2.616.5-2.61(58)3.41.01(59)6.51.98(60)6.80.750.5(61)13.750.125-2.75(62)1.53+23.47.2(63)22.9-13.68+12.68(64)4.711-4.7(65)28.86.3-6.318.8(6
4、6)4.8+5.24(67)5.372.37+1.8)(68)10.01-2.78+1.59(69)2.851.250.8(70)10.50.2512(71)3.791.6+7.391.6-91.6(72)3.20.82+3.21.18(73)4.050.5-1.14(74)1.5899+1.58(75) 12.50.42.58(76)7.7520(3.24-3.04)(77) 43.2-1.83-4.6(78) 4.27.8+2.24.2(79)0.873.16+4.64(80)12.54.8(81) 4.74.7+4.76.3-4.7(82)12.53.20.25(83) 23.47.2+
5、6.50.8(84) 20.64-9.83-0.17(85)6.8(1.2+0.5)0.04(86) 7.26-5.41.74-1.6(87) 2.06+2.0699(88)9.5101(89)100-2.70.36-2.55(90)(1.62+1.62+1.62+1.62)1.82.5(91)2.80.5+0.528.2-0.5(92)3.22.51.25(93)7,27.22-6.40.9(94) 4.6532+2.546.5+0.465430(95) 7.2567.875+7250.7875+72500.053375(96)0.461.9+0.541.9(97)3.45102(98)12
6、.588(99)13.650.256(1OO)28.986.3-3.15三、解方程(101)8x=24(102)x0.5=1.2(103)x3.8=9.53(104)4.06+x=7.11(105)x1.5=1.5(106)2.4x=26.4(107)3-24=9(108)13x27=40(109)966+4x=56(110)3-1.2x=9(111)3.6x+21.4=8.2(112)180.6-10x=4.26(113)0.4(-3)=0.72(114)1.5(10-)=3(115)2.8(3+x)=3.50.2(116) 0.8 (x+4.8) =5.2(119) 1.6-9=3.8(1
7、22) 0.420-0.4x=6(117)(-6)0.5=3(118)4-4518=21(120)4(0.9+x)=4.8(121)(-1.9)5=1.1(123)24-8x=28.8(124)4.5x1.6x=42.7(125)(7-1.4)x=2.8(128)0.5(-1.8)=2.4(131)0.420-0.4x=6(134)4-10=x+(126)9-5.26=4.8(127)(2.5+x)0.8=5(129)22.525x=135(130)4(0.3+x)=4.8(132)(4-0.32)+1.6=2.08(133)3.5-=17.5110(135)8.9-5x=2.7(136)3.545-1.7x=13.45(137)1.6x+2x0.7=18(138)4-0.32+1.6=2.08(139)28-3.6=20(140)3.5-0.8x=11.34(141)9-145.5=58x)=3.50.2(144)3x+27=50(142)6.2-=41.6(143)2.8(3+(145)12(x+3.7)=144(146)5-311=42
