七年级下册数学平方根的方程,跪求!5道,带答案
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二元一次方程:
1)66X 17 Y = 3967
25X Y = 1200
答案:X = 48岁= 47
(2)18X 23 Y = 2303
74X-Y = 1998
答案:X = 27 Y = 79
(3)44X 90 Y = 7796
44X Y = 3476
答案:X = 79 Y = 48
(4)76X-66Y = 4082
30X-Y = 2940
答案:X = 98 Y = 51
(5)67X 54 Y = 8546 71X-Y = 5680
X = 80 Y = 59
(6)42
1)66X 17 Y = 3967
25X Y = 1200
答案:X = 48岁= 47
(2)18X 23 Y = 2303
74X-Y = 1998
答案:X = 27 Y = 79
(3)44X 90 Y = 7796
44X Y = 3476
答案:X = 79 Y = 48
(4)76X-66Y = 4082
30X-Y = 2940
答案:X = 98 Y = 51
(5)67X 54 Y = 8546 71X-Y = 5680
X = 80 Y = 59
(6)42
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