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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

4/5×2/7+1/7÷3/4 =8/35+4/21 =44/105

4/7 *5/8+(1/4 )/(8/5) =5/14 -(1/4 )* 5/8 =5/14-5/32 =80/224-35/224 =45/224

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,...

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

=5/7+(3/4+2/7) =5/7+2/7+3/4 =1+3/4 =7/4

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