2.原来甲盒有(
x
)个球,乙盒有(
y
)个球
y+10=6(x-10)
3(x+10)=y-10+11
解得:x=33
y=128
3.设十为是x个位是x+5
10x+x+5+10(x+5)+x=143
解得x=4
原两位数是49
4.甲速度是(x
),乙速度是(
y)
2x+2y=300
30x
=
30y+300
解得:
x=80
y=70
单位:米/分钟
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