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简便方法计算题1/2×2/5+9/25÷9/20

1/2×2/5+9/25÷9/20 =1/5+9/25×20/9 =1/5+4/5 =1

5/6*1/19+20/9*2/19+25/18*6/19 =5/6*1/19+40/9*1/19+25/3*1/19 =(5/6+40/9+25/3)*1/19 =245/18*1/19 =245/342

1.45+15×6= 135 2.250÷5×8=400 3.6×5÷2×4=60 4.30×3+8=98 5.400÷4+20×5= 200 6.10+12÷3+20=34 7.(80÷20+80)÷4=...

按运算顺序 2/5x2/10+9/10x0.4-2÷5x1/10 =2/5x2/10+9/10x2/5-2/5x1/10 =2/25+9/25-1/25 =10/25 =2/5 简便算法 2/5x2/10+9/10x0.4-2÷5x1/10 =2/5x2/10+9/10x2/5-2/5x1/10 =2/5x(2/10+9/10-1/10) =2/5x1 =2/5

20-1/4×2/5×5/6 =20-1/10×5/6 =20-1/12 =19又12分之11; (7/16+4/5)÷3/5 =(7/16+4/5)×5/3 =35/48+4/3 =(35+64)/48 =99/48 =33/16; 18/25×9/10+7/25×9/10+9/10 =9/10×(18/25+7/25+1) =9/10×2 =9/5; 解方程x-3/8x=5/10 5x/8=5/10; x=4/5; 9x÷1/2...

1)25%*132+1/4*8 2)32*0.125*25 =1/4*132+1/4*8 =(4+8)*0.125*25 =1/4*(132+8) =(4*25)*(8*0.125) =1/4*140 =100*1 =35 =1000 3)75%*76+25*4+0.75*12 =3/4*76+3/4*12+25*4 =3/4*88+100 =166 4)3200*1/8÷2/5+1270 5)(2/3+4/5)*7/6 =400*5/2+1270...

您好: 2:5/4=8:5 9/25:3/5=3:5 2/3:5/6=12:15=4:5 1/5:1/20=4:1 5/9:1=5:9 2:3/8=16:3 3/4:4/3=9:16 如果本题有什么不明白可以追问,如果满意记得采纳 如果有其他问题请采纳本题后另发点击向我求助,答题不易,请谅解,谢谢。 祝学习进步!

4.25x0.45-1/2x9/20+9/4÷20/9 =4.25x9/20-0.5x9/20+2.25x9/20 =(4.25-0.5+2.25)x9/20 =(4.25+2.25-0.5)x9/20 =(6.5-0.5)x9/20 =6x9/20 =3x9/10 =27/10 =2.7 谢谢,请采纳

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 ...

1.125*3+125*5+25*3+25 2.9999*3+101*11*(101-92) 3.(23/4-3/4)*(3*6+2) 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 + (...

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