作业帮若|X-3|+|Y+15|=0,则3X+2Y=?
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若|X-3|+|Y+15|=0,则3X+2Y=?
若|X-3|+|Y+15|=0,则3X+2Y=?
若|X-3|+|Y+15|=0,则3X+2Y=?
绝对值总是大于或等于0的,要使两个绝对值相加等于0,必定每个绝对值是等于0的,因此,x=3,y=-15
-21
x=3
y=-15
3x+2y=3*3+2*(-15)
=9-30
=-21
∵|X-3|+|Y+15|=0→0+0=0
∴X-3=0；Y+15=0
∴X=3；Y=-15
将X=3，Y=-15代入3X+2Y，得：
3×3+2×（-15）=-21
呵呵，开玩喜啊
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