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计算下面各题 能简算的要简算.①12+14+18+116+132+164②88888×888
问题详情
计算下面各题,能简算的要简算.
①
②88888×88889+44444×22222
③
④1-(
参考答案
①12+14+18+116+132+164,
=1-12+12-14+14-18+18-116+116-132+132-164,
=1-164,
=6364;
②88888×88889+44444×22222,
=88888×88889+88888×11111,
=88888×(88889+11111),
=88888×100000,
=8888800000;
③119+2021919+30303191919-404040419191919+5050505051919191919,
=119+2×10119×101+3×1010119×10101-4×101010119×1010101+5×10101010119×101010101,
=119+219+319-419+519,
=1019;
④1-(12-13)-(13-14)-(14-15)-(15-16),
=1-12+13-13+14-14+15-15+16,
=1-12+16,
=23.
考点: