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最难的简便计算加答案

1000+999-998-997+996+995-994-993……+108+107-106-105+104+103-102-101 【解答】 1000+999-998-997+996+995-994-993+……+108+107-106-105+104+103-102-101 =1000+(999-998-997+996)+(995-994-993+992)……+108+(107-106-105+104)+(103-102)-101 ==1000+0+0……+0+1-101 =900

1. 1/4 + 3/4 ÷ 2/3 2. 8/7 * 21/16 + 1/2 3. 101 * 1/5 1/5 * 21 4. 3/7 * 49/9 - 4/3 5. 8/9 * 15/36 + 1/27 6. 12* 5/6 2/9 *3 7. 8* 5/4 + 1/4 8. 6÷ 3/8 3/8 ÷6 9. 4/7 * 5/9 + 3/7 * 5/9 10. 5/2 -( 3/2 + 4/5 ) 11. 7/8 + ( 1/8 + 1/9 ) 12. 9 * 5/6 + 5/6 13. 3/4 * 8/9

计算题.(共20分) 1、 直接写出得数.(每题0.5分) 1460÷4= 0÷14987794515415 = 0.375*0.625= * = 1÷124 = 124÷4 = 5*20%÷5*20%= 124 -102 = 2、 解下列方程.(每题2分) 12x- x=451 50%x-1.2*12 =1.6 3、 脱式计算.(能简算的要

158+262+138 375+219+381+225 5001-247-1021-232 (181+2564)+2719 378+44+114+242+222 276+228+353+219 (375+1034)+(966+125) (2130+783+270)+1017 99+999+9999+99999 7755-(2187+755) 2214+638+286 3065-738-1065

观察下的每项都是(n+1)^3-n,你可以一次试试的!1*2*3+2*3*4+3*4*5++25*26*27+26*27*28= (2 - 2) + (3 - 3) + …… + (27 - 27)= 1 + 2 + 3 + …… + 27 - (1+2+3+

望采纳谢谢.(1)2.5*32*0.125 =(2.5*4)*(8*0.125) =10*1 =10 (2)3.5-7+6.5 =3.5+6.5-7 =3 (3)1.2*2.5+0.8*2.5 =2.5(1.2+0.8) =25 (4)8.9*1.25-0.9*1.25 =1.25(8.9-0.9) =10 (5)12.5*7.4*0.8 =12.5*0.8*7.4 =74 (6)6.5*9.5+6.5*0.5 =6.5*(9.5+0.5) =6.5*10

29. 45 * 2/3 + 1/3 * 15 30. 7/19 + 12/19 * 5/6 31. 1/4 + 3/4 ÷ 2/3 32. 8/7 * 21/16 + 1/2 33. 101 * 1/5 1/5 * 21 34.50+160÷40 35.120-144÷18+35 36.347+45*2-4160÷52 37(58+37)÷(64-9*5) 38.95÷(64-45) 39.178-145÷5*6+42 40.812-700÷(9+31*11

300÷125÷8=300÷(125*8)=300÷1000=0.3396-96-172-28 =(396-96)-(172+28)= 300-200= 100 125*24 = 125*8*3 = 1000*3= 3000360÷24=360÷6÷4=60÷4=15240÷48=240÷24÷2=10÷2=5800÷32=800÷8÷4=100÷4=2527+456+73 =(27+73)+456 =100+

(1)80.9x5.5+80.9x4.5(2)8.88x1.25(3)25x8x4(4)2.4x0.8x12.5(5)19.42x3.6-3.6x9.42(6)9.9x2.8+0.28(7)1.1x10.1(8)(2.5+25)x4(9)1.25x25x0.8x0.04(10)(0.125+12.5)x8如果我回答的好,请采纳.祝你好好学习,天天向上.

1、56+31+24=(56+24)+31=80+31=1112、615+475+125 =615+(475+125)=615+600=12153、125*64 =125*8*8=1000*8=80004、 89+101+111=101+(89+111)=101+200=3015、24+127+476+573 =(24+476)+(127+573)=500+700=12006、400

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