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解方程:1.(1/2-9)X1/5=X-92.1/19x+(1540-x)x1/10=1003.3/5xX18+2/5xX(18-10)=2870

题目详情
解方程:1.(1/2-9)X1/5=X-9 2.1/19x+(1540-x)x1/10=100 3.3/5x X18+2/5x X(18-10)=2870
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答案和解析
1.(1/2-9)X1/5=X-9
x=9+1/10-9/5
x=7又3/10
2.1/19x+(1540-x)x1/10=100
10x+(1540-x)x19=100x190
10x+1540x19-19x=100x190
9x=(1540-1000)x19
x=1140
3.3/5x X18+2/5x X(18-10)=2870
3/5x X18+2/5x X18-4x=2870
(3/5+2/5)x X18-4x=2870
18x-4x=2870
14x=2870
x=205
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