手脑速算直加直减试题1页.docx

一位数直加直减9-5-2-1+5+2-8+3= 9-5-4+7+2-5-3= 9-6+1-4+5+3-6+2= 2+5+2-5-3+6= 3+1-2+6-6+2= 4-2+1+5-7+3=6-5+3-2+7-8= 2+1-3+4-2+6= 3+5-2-5+7-5= 6-5+3+5-8+3-2+6=7-2+4-6-2-1= 2+2+5-6+5-1=6-5+7-2-1+4= 1+3+5-7-1+6=5+2+2-3-5-1= 5+2+2-3-5-1+8-