初二数学计算题.docx
( 1)5253yxyx ( 2) 523xyxy ( 3)152yxyx ( 4)1302yxyx ( 5)14329mnnm ( 6)qpqp451332 ( 7)924523nmnm ( 8)524753yxyx ( 9)7441156yxyx ( 10)53412911yxyx ( 11)2.03.05.0523151yxyx ( 12)ayxayx343525 (13) {√5 X−√3 Y = 1√3 X−√5 Y = 2 (14) 解方程 √3 X-1=√2 X (15){2x+9y = 813x+y = 34 (16) {9x+4y = 358x+3y = 30 (17){7x+2y = 527x+4y = 62 (18){4x+6y = 549x+2y = 87 (19){ 2x+y = 72x+5y = 19 (20){ x+2y = 213x+5y = 56 (21)6430524mnnm (22)323113121yxyx(23)110117.03.04.0yxyx (24)722013152yxyx (25)cyxcyx72963112 ( c 为常数) (26)cdyxdcyx23434 ( dc、 为常数) (27)21418122 (28) 2)352( (29) 14 5 1 0 8 1 1 2 53 (30) 284)23()21( 01 (31)先化简,再求值:112 12222 xxx xxx x, 其中 23 x . (32)已知: 3x22xy ,求: 4yx )( 的值。 (33) xxxx 1246932 (34) 3 5 3 3 5 3 (35) 4831152023 (36) ))(( 36163 (37) 63312 (38) )( 102132531 (39) zyx 1001010 1 (40)20245 ; (41)144250 81010 ; (42)521312321 (43) )(babba 1223 . (44)27 121352722 (45)bacabc4322(46)已知:2 420 x,求221xx 的值. (47) 22 2)7( (48) 2)51((49) 2)32((50) 2)7.0( (51) 2412 (52) )27(3 (53) 714 (54) 22332abcba(55) 32 932 bba (56) )36)(16(3 (57)521312321 (58) 01691026222 xx(59) 1 1 22 1 2 3 1 5 4 83 3 3 (60) 4554452021515 (61) 126123224 (62) 112 1 2 1 2 5 0 . 85 2 7 (63) 1825232 (64) 2323