逗留时间保持不变,且在最短时间内看完三个景点返回到 A 处,请你为他设计一条步行路线, 并说明这样设计的理由(不考虑其他因素). 1. 7(2x-1)-3(4x-1)=4(3x+2)-1 2. (5y+1)+ (1-y)= (9y+1)+ (1-3y) 3 .[ (- 2)-4 ]=x+2 4. 20%+(1-20%)(320-x)=320 × 40% 5. 2(x-2)+2=x+1 6. 2(x-2)-3(4x-1)=9(1-x) 7. 11x+64-2x=100-9x 8. 15-(8-5x)=7x+(4-3x) 9. 3(x-7)-2[9-4(2-x)]=22 10. 3/2[2/3(1/4x-1)-2]-x=2 (x+5y)-(3y-4x)=x+5y-3y+4x 1/2(x6^2-y)+1/3(x-y^2)+(x^2 )( ^为平方号) 10a+6b-7a+3b-10a+10b+12a+8b 4xy-2y+3x-xy (3x-5y)-(6x+7y)+(9x-2y) 2a-[3b-5a-(3a-5b)] (6m2n-5mn2)-6(m2n-mn2) (5x-4y-3xy)-(8x-y+2xy) a-(a-3b+4c)+3(-c+2b) 7x2-7xy+1 6-5b-(3a-2b)-(1-6b) (5x-4y-3xy)-(8x-y+2xy) (3x2-4xy+2y2)+(x2+2xy-5y2) (x-y)2-(x-y)2-[(x-y)2-(x-y)2] (2k-1)x2-(2k+1)x+3 2(x-2)-3x-2 2y-3y+1-6y 3b-6c+4c-3a+4b 2a-5b+4c-7a+5a+5b-4c 4a+6c+7a-6a+7b-3c-6b 5b+2c-7b+4z-3z 3b+3c-6a+8b-7c-2a 3c-7b+5z-7b+4a-6n+8b-3v+9n-7v
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