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2/5×括号1/5+8/21÷(4/7)括号脱式计算

2/5×[1/5+8/21÷(4/7)] =2/5x(1/5+2/3) =2/5x(13/15) =26/75

see

=7/32+7/10=35/160+112/160=147/160

24×(1/4+5/6-7/8) =6+20-21 =5

1. 1/8*14/8/7 =7/4/8/7 =7/4*7/8 =49/*32 2. 9/14/(6/5-3/4)*7/24 =9/14/9/20*7/24 =9/14*20/9*7/24 =20/14*7/24 =5/12 第三小题题目再发准确点行吗

(1+3+5+7+…+2003)-(2+4+6++8+…+2002) =1+(3-2)+(5-4)+.....+(2003-2002) =1+1x1001 =1002

1/2 2/3×括号3/4-1/6括号除以7/9脱式计算 解: 1/2+ 2/3×(3/4-1/6)除以7/9 =1/2+2/3×7/12÷7/9 =1/2+1/2 =1

①2-[1/5+(2/5-5/7)] =2-1/5-2/5+5/7 =7/5+5/7 =49/35+25/35 =74/35; ②(2.5-2.5*0.4)÷4速度啊!! =2.5×(1-0.4)÷4 =2.5×0.15 =0.375 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,...

=5.7+14.75+2.77-8-6.87+2.5/47.23 =5.7+2.77+14.75-14.87+0.05 =5.7+2.65+0.05 =8.4

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