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1、計(jì)算題
1、 (得數(shù)保留一位小數(shù))
(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 (10)4.70.59
2、(除不盡的保留兩位小數(shù))
(11)31.2 (12) 2.70.36 (13) 88.41.7 (14) 7.5250.38
(15)415 (16)91.20.57 (17) 84.841.2 (18) 5.636.1
(19)5677 (20)1.47
2、4.2 (21)19.190.95 (22) 56.296.1
(23)2333 (24)7.410.57 (25) 21240 (26)9.6816
(27) 3.850.76 (28)53.34.7 (29)56.296.1 (30)28.7431
3、得數(shù)用循環(huán)小數(shù)表示。
(31) 0.20.06(32) 1311 (33) 30.133 (34)1715
(35)7.82.2(36)5.529(37)67.811(38)87
2、 能簡(jiǎn)便計(jì)算的要簡(jiǎn)便計(jì)算
(39)2.53.60.9 (40)12.50.38.8 (41)1.25(100
3、-8)
(42)42(5.250.25) (43)0.4+12.60.280.2 (44) 8.4-8.41.51.8
(45)12.54.5+4.512.5+12.5 (46) 1.298 (47)2.41.250.3
(48) (20-0.89) 5.7 (49)0.813-3.12+5.28
(49) (50) 118-(11.4-12.50.8)
(51)50(6.70.02) (52) (0.25+2.5+25)0.4 (53) 3.51.02+350.098
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
(66)4.8+5.24 (67)5.37—(2.37+1.8) (68)
5、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)7.75[20(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
6、.74.7+4.76.3-4.7 (82)12.53.20.25
(83)23.47.2+6.50.8
(84)20.64-9.83-0.17 (85)6.8(1.2+0.5)0.04
(86) 7.26-5.4+1.74-1.6
(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、) 7.2[(7.22-6.4)0.9]
(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) 12.5 88 (99) 13.650.256 (100) 28.986.3 -3.15
三、解方程
(101)8x=24 (102)x0.5=1.2 (
8、103)x-3.8=9.53 (104)4.06+x=7.11
(105) x1.5=1.5 (106) 2.4x=26.4 (107)3x-24=9 (108)13x+27=40
(109)966+4x=56 (110)3x-1.2x=9 ( 111)3.6x+21.4=8.2 (112)180.6-10x=4.26
(113)0.4(x-3)=0.72 (114) 1.5(10-x)=3 (115)2.8(3+x)=3.50.2
(116)0.8(x+4.8)=5.2 (117)(x-6)0.5=3 (118)4x-45+18=2
9、1
(119)1.6x-9=3.8 (120)4(0.9+x)=4.8 (121) (x-1.9)5=1.1
(122)0.420-0.4x=6 (123)24x-8x=28.8 (124)4.5x+1.6x=42.7 (125) (7-1.4)x=2.8
(126) 9x-5.26=4.8 (127)(2.5+x)0.8=5 (128)0.5(x-1.8)=2.4
(129)22.52+5x=135 (130)4(0.3+x)=4.8 (131)0.420-0.4x=6
(132) (4x-0.32)+1.6=2.08 (133)3.5x-x=17.5 (134)4x-10=x+110
(135)8.9-5x=2.7 (136)3.545-1.7x=13.45 (137)1.6x+2x0.7=18
(138)4x-0.32+1.6=2.08 (139)28-x+3.6=20 (140)3.5x-0.8x=11.34
(141)9x-145.5=58 (142)6.2x-x=41.6 (143)2.8(3+x)=3.50.2
(144)3x+27=50 (145)12 (x+3.7)=144 (146)5x-311=42