口算．
12﹣8= 68+7= 89+2= 53﹣12= 17+9= 99﹣90=
71﹣6= 76+23= 43+8= 87﹣55= 31+45= 84﹣41=
47﹣9= 13+60= 40+14= 48﹣24= 78﹣20= 58+10=
81+12= 20+8= 38﹣6= 78+8= 68﹣60= 53﹣3=
口算．
12﹣8= 68+7= 89+2= 53﹣12= 17+9= 99﹣90=
71﹣6= 76+23= 43+8= 87﹣55= 31+45= 84﹣41=
47﹣9= 13+60= 40+14= 48﹣24= 78﹣20= 58+10=
81+12= 20+8= 38﹣6= 78+8= 68﹣60= 53﹣3=
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千克放入乙袋中．两袋的重量刚好相等．原来甲袋比乙袋重多少千克？
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