计算:2+4+6+8+10+12+14+16
14 查阅
计算:2+4+6+8+10+12+14+16+18
参考答案:
2+4+6+8+10+12+14+16+18 =(2+18)+(4+16)+(6+14) +(8+12)+10 =20+20+20+20+10 =90
计算:2+4+6+8+10+12+14+16+18
参考答案:
2+4+6+8+10+12+14+16+18 =(2+18)+(4+16)+(6+14) +(8+12)+10 =20+20+20+20+10 =90