初一数学上册计算题专项训练72.docx

1、初一数学上册计算题专项训练72 4 4 ()()(3) 21(1)3(1) 7 7 5 1 6 ( )( ） 15(14)8(20) 4 2 7 1 (0.4)(7) (2)432 (1)2557 4 1 1 1 ()()0 15(1)2(4 7 9 2 1 3 1 ( )( ) 13(10)8(20) 6 4 6 1 1 ( )(60) (4)442 (1)2844 5 3 (12)(18) 0(17) 1.5(25) 1 1 ()() 133(2010) (4)334 8 4 220(12)(3) 6.2(9.2)(1.9)6.4 2 1 1 4 7 9 ()() 5.8()(4.8) 7

2、 3 7 5 5 5 (5x9) y2(98c) 12m5(7y6t) (5my)9(8x5c) 1 (206y)t 7(5d3bc4) 8 1 1 (yz)(ef) 2(9bx)3(n5q) 8 8 3y(8y9) y(7y7q)(6qy) 7(9a5)5a 5(8y4)(2y4) 8(ab2a)(3a6b) 18(abc8a)6(9a5abc) 9(xy7z)(xy6z) 9(pqpr)(7pqpr) 5 x 1 x 0.4x0.25.45.9x 3 6 3 8 1 5x6x 2(x4)2(x7)17 3 7 1 4 (6x9)x6 9x3(14x)2 5 5 y1 y3 5 4x4.5(

3、x6)40 2 5 0.2x0.31.70.5x 3(4x2)18 6 2 ()()(2) 5(3)3(3) 7 7 5 1 1 ( )( ） 19(18)4(13) 6 8 3 1 (0.1)(10) (5)253 (1)1025 5 1 1 1 ()()0 21(4)2(4 3 2 3 1 1 1 ( )( ) 24(29)9(15) 3 2 5 7 6 ( )(50) (4)422 (1)2345 8 7 (2)(10) 3(1) 9.5(9.5) 1 1 ()() 170(54) (4)412 9 7 71(23)(22) 9.9(7.5)(2.7)1.6 2 1 1 2 3 4 ()

4、() 5.8()(9.8) 7 6 7 7 5 5 (7a1) x6(54b) 9a4(3y6t) (7ay)2(2a6b) 9 (104x)t 5(6a7xy1) 8 1 1 (ab)(ef) 4(7bx)9(n6p) 7 2 3a(2a5) 4a(6a5p)(9p3a) 7(8a3)9a 9(8m5)(8m8) 7(ab7a)(4a5b) 3(abc8a)2(6a6abc) 4(xy7z)(xy8z) 4(pqpr)(5pqpr) 5 x 1 x 0.3x0.73.70.9x 3 6 3 4 1 2x3x 7(x1)3(x6)1 9 4 1 3 (5x2)x8 8x3(5x)8 4 5 y

5、3 y2 4 2.5x5.5(x3)50 3 5 0.6x0.55.27x 6(5x3)4 3 1 ()()(8) 9(2)2(4) 7 7 1 1 1 ( )( ） 9(16)10(20) 3 2 3 1 (0.3)(8) (2)423 (1)1815 4 1 1 1 ()()0 25(1)2(2 8 9 4 1 7 8 ( )( ) 10(14)2(14) 5 8 7 1 4 ( )(80) (3)213 (1)1822 3 5 (6)(13) 16(4) 3.5(16) 1 1 ()() 42(53) (3)453 4 8 1611(12)(26) 3.7(3.2)(1.9)8.7 2

6、1 1 3 2 9 ()() 3.8()(7.4) 3 6 5 5 5 5 (6x2) x9(56b) 9m4(6n4z) (2mn)6(8x4b) 1 (48x)z 8(4c8bc6) 5 1 1 (xy)(mn) 2(8ax)7(n8p) 9 4 7m(4m6) m(6m9d)(8d8m) 5(7t3)6t 6(7n1)(8n9) 4(ab5a)(7a4b) 9(abc6a)6(7a3abc) 9(xy3z)(xy6z) 3(pqpr)(8pqpr) 5 x 1 x 0.6x0.46.91.6x 9 6 3 2 1 9x3x 5(x6)2(x8)19 7 7 1 2 (4x5)x6 3x7

7、(16x)1 8 5 y1 y1 4 3x1.5(x2)20 3 6 0.5x0.96.43.2x 9(5x2)15 5 4 ()()(5) 8(4)3(2) 7 7 6 1 4 ( )( ） 27(25)4(10) 5 4 3 1 (0.7)(10) (3)413 (1)2153 4 1 1 1 ()()0 18(1)2(2 2 6 9 1 1 1 ( )( ) 15(20)3(14) 5 7 4 5 3 ( )(80) (3)442 (1)2220 4 4 (5)(1) 2(2) 9.5(21) 1 1 ()() 94(116) (3)422 8 9 342(3)(13) 2.4(8.6)

8、(4.6)8.1 2 1 1 3 4 3 ()() 8.3()(8.4) 3 5 8 7 5 5 (5b4) y6(53c) 13x2(9b2c) (7xb)8(8b2c) 1 (84y)c 2(4c8ab5) 4 1 1 (ab)(pq) 4(6bx)3(m7p) 8 3 2b(3b9) 4b(4b9c)(5cb) 9(5b6)8b 8(8y9)(3y6) 6(ab3a)(7a6b) 5(abc8a)2(8a6abc) 6(xy9z)(xy9z) 8(pqpr)(7pqpr) 7 x 1 x 0.1x0.16.57.9x 3 2 3 2 1 8x4x 3(x7)8(x8)15 5 9 1 3

9、 (6x5)x2 5x6(5x)7 7 5 y3 y2 8 2.5x6.5(x6)45 4 5 0.4x0.69.67.8x 4(8x5)3 5 5 ()()(8) 3(3)3(4) 7 7 6 1 1 ( )( ） 17(20)10(10) 5 6 3 1 (0.5)(300) (2)312 (1)1764 3 1 1 1 ()()0 24(3)3(2 6 6 8 1 1 1 ( )( ) 20(27)6(14) 3 7 6 4 1 ( )(50) (2)433 (1)1418 5 3 (9)(12) 3(6) 9.5(24.5) 1 1 ()() 104(196) (0)312 3 8 3

10、614(9)(11) 4.3(8.5)(1.7)6.9 2 1 1 2 7 3 ()() 8.8()(8.1) 7 4 7 5 5 5 (3y9) x5(68c) 16a5(3n3c) (9an)7(7y3c) 10 (202x)c 6(6b2mn4) 9 1 1 (ab)(st) 4(7ay)4(m5p) 3 3 9b(4b4) b(7b9c)(8cb) 8(8t10)8t 1(5b7)(6b6) 3(ab8a)(3a9b) 15(abc5a)8(3a6abc) 9(xy6z)(xy8z) 4(pqpr)(6pqpr) 7 x 1 x 0.6x0.78.52.3x 3 4 9 2 1 8x9x 9(x8)8(x5)19 9 6 1 1 (7x5)x4 9x8(3x)7 9 5 y1 y2 3 1x9(x4)25 2 6 0.3x0.373.1x 5(7x2)19