七年级数学下册第8单元二元一次方程组测试题(A卷,无答案)新人教版.doc

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1、1第八章 二元一次方程组一、填空题1、方程 93yx的正整数解是_。2、已知方程组 1524,不解方程组则 x+y=_。3、若二元一次方程组 3byax和 15yxac同解,则可通过解方程组 _ 求得这个解。4、已知点 A(3x6,4y15),点 B(5y,x)关于 x轴对称,则 xy 的值是_。5、若 02)532(2yxyx,则 , 。6 在 49中,如果 2 = 6,那么 x= 。7已知 18xy是方程 31mxy的解,则 m= 。8若方程 m + n = 6的两个解是 x, 21y,则 m = ,n = 。9如果 2150xyx,那么 x= , = 。10、在ABC 中,AC=25,B

2、A=10,则B=_。二、选择题11、下列不是二元一次方程组的是( )A14yxB 3624xy C 4xy D 35210xy12、如右图,ABBC,ABD 的度数比DBC 的度数的两倍少 15,设ABD 和DBC的度数分别为 x、y,那么下面可以求出这两个角的度数的方程组是( )A、 9015 B、 90215xy 2C、 90152xy D、 90215xy13、下列各组数中 2yx 61yx是方程104yx的解的有 ( )A.1个 B.2 个 C.3 个 D.4 个14、若实数满足(xy2)(xy1)=0,则 xy 的值为( )A、 1 B、2 C、 2 或1 D、2 或 115、方程组

3、 5xy的解是( )A 12 B 21 C xy D 21xy三、解答下列各题(共 16分)16解方程组324mn17、某纸品加工厂为了制作甲、乙两种无盖的长方体小盒(如图) ,利用边角料裁出正方形和长方形两种硬纸片,长方形的宽与正方形的边长相等。规格 150张正方形硬纸片和300张长方形硬纸片全部用于制作这两种小盒,可以做成甲、乙两种小盒各多少个?18如图,8 块相同的长方形地砖拼成一个长方形,每块长方形地砖的长和宽分别是多少?360cm四、附加题1、已知 y=x2pxq,当 x=1时,y 的值为 2;当 x=2 时,y 的值为 2。求 x=3 时 y的值。2、甲、乙两人共同解方程组 byxa2415,由于甲看错了方程中的 a,得到方程组的解为 13yx;乙看错了方程中的 ,得到方程组的解为 45yx。试计算207206ba的值.

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