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六年级上册数学简便计算

1.4/7 * 5/9 + 3/7 * 5/9 =(4/7+3/7)x5/9=1x5/9=5/92. 5/2 -( 3/2 + 4/5 )=5/2-3/2-4/5=1-4/5=1/53. 6 *( 1/2 + 2/3 )=6x1/2+6x2/3=3+4=74. 8 * 4/5 + 8 * 11/5=8x(4/5+11/5)=8x3=24 5. 31 * 5/6 5/6 =(31-1)x5/6=30x5/6=256. 4/5 * 25/16 + 2/3 * 3/4 =5/4+1/2=5/4+2/4=7/47. 101 * 1/5 1/5 * 21 =(101-21)x1/5=80x1/5=16

4/5+2/3+1/5+1/3=(4/5+1/5)+(2/3+1/3)=1+1=24/5x2/3+4/5x1/3=4/5x(2/3+1/3)=4/5x1=4/520x(1/5+1/4)=20x1/5+20x1/4=4+5=919x1/18=(18+1)x1/18=18x1/18+1x1/18=1+1/18=19/18

6.9+4.8+3.1 0.456+6.22+3.78 15.89+(6.75-5.89)4.02+5.4+0.98 5.17-1.8-3.2 13.75-(3.75+6.48)3.68+7.56-2.68 7.85+2.34-0.85+4.66 35.6-1.8-15.6-7.23.82+2.9+0.18+9.1 9.6+4.8-3.6 7.14-0.53-2.475.27+2.86-0.66+1.63 13.35-4.68+2.65 73.8-1.64-

都可以简化运算,采用交换律,结合律,分配率及一些小技巧.比如第1题,原式=106.25+3.85+1.75=108+3.85=111.85

①5.76*6+2..24*6-3*2 ②(2/1+3/1-5/1)*5+3.5*2-0.2*5 ③5.2*6÷6/1+1.8 ④3.3*2.2+3.7*2.2*10 ⑤9.7+6.5-1.2+6÷3 ⑥3.5*10-3.6*5-6*2.5 ⑦3.69+6.16-0.12 ⑧63.7+5.2-24.6*1.5 ⑨8.2-6.6+4.5*10-15.33.5+6.7-6.3+6.1

10除以9/5+6/1*4

(1)2.64*1.7-2.64*0.7=2.64*(1.7-0.7)=2.64*1=2.64 (2)31.5*1.07-3.15*0.7=3.15*10.7-3.15*0.7=3.15*(10.7-0.7)=3.15*10=31.5 (3)2.7*5.7-2.7+5.3*2.7=2.7*(5.7-1+5.3)=2.7*10=27 (4)0.625÷0.125*0.8=(0.625*0.8)*8÷(0.128*8)=0.5*8÷1=4 (5)18.6*6

(1-1/2*2)*(1-1/3*3)*```````*(1-1/10*10)=(1-1)*(1-1)*……*(1-1)=0

1. 3/7 * 49/9 - 4/3 2. 8/9 * 15/36 + 1/27 3. 12* 5/6 2/9 *3 4. 8* 5/4 + 1/4 5. 6÷ 3/8 3/8 ÷6 6. 4/7 * 5/9 + 3/7 * 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 * 5/6 + 5/6 10. 3/4 * 8/9 - 1/3 11. 7 * 5/49 + 3/14 12. 6 *( 1/2 + 2/3 ) 13. 8 * 4/5 + 8 * 11/5

1、2/3*5/7+2/3*2/7 =(2/3)*(5/7+2/7)=2/3.2、5/6*3/8+5/8÷5/6 =5/16+6/8=17/16=1又1/16. 3、3-3/2*10/21-2/7=3-5/7-2/7=3-(5/7+2/7)=3-1=2.4、(1/2-1/3+1/6)*24 =12-8+4=8.5、3/10÷(1/5+1/4)-2/3 =3/10÷9/20-2/3=2/3-2/3=0.6、2/15÷[(0.75-1/2)*2/5]=2/15÷[0.3-0.2]=2/15*10=4/3=1又1/3.7、(4/5*5/8+1/2)÷3/4=(1/2+1/2)*4/3=4/3=1又1/3.

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