用简便方法计算(1)678+(354+322)(2)283+147+17+1653(3)384-(37+184)(4)2904-1327-173(5)65
用简便方法计算(1)678+(354+322)(2)283+147+17+1653(3)384-(37+184)(4)2904-1327-173(5)653-197(6)...
用简便方法计算(1)678+(354+322)(2)283+147+17+1653(3)384-(37+184)(4)2904-1327-173(5)653-197(6)125×17-125(7)235×99(8)(1300-520)÷13(9)67×21+18×21+85×79(10)222222×999999.
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(1)678+354+322 =678+322+354 =1000+354 =1354; (2)283+147+17+1653 =283+17+(147+1653) =300+1800 =2100; (3)384-(37+184) =384-(184+37) =384-184-37 =200-37 =163; (4)2904-1327-173 =2904-(1327+173) =2904-1500 =1404; (5)653-197 =653-200+3 =453+3 =456; (6)125×17-125 =125×(17-1) =125×16 =125×8×2 =1000×2 =2000; (7)235×99 =235×(100-1) =235×100-235×1 =23500-235 =23265; (8)(1300-520)÷13 =1300÷13-520÷13 =100-40 =60; (9)67×21+18×21+85×79 =21×(67+18)+85×79 =21×85+85×79 =85×(21+79) =85×100 =8500; (10)222222×999999 =222222×(1000000-1) =222222×1000000-222222×1 =222222000000-222222 =222221777778. |
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