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六年级数学计算(能简便的要简便)1、2/3×5/7+2/3×2/72、5/6×3/8+5/8÷5/63、3-3/2×10/21-2/74、(1/2-1/3+1/6)×245、3/10÷(1/5+1/4)-2/36、2/15÷(0.75-1/2)×2/57、(4/5×5/8+1/2)÷3/4要列算式,打得
题目详情
六年级数学计算(能简便的要简便)
1、2/3×5/7+2/3×2/7 2、5/6×3/8+5/8÷5/6 3、3-3/2×10/21-2/7 4、(1/2-1/3+1/6)×24
5、3/10÷(1/5+1/4)-2/3 6、2/15÷【(0.75-1/2)×2/5】 7、(4/5×5/8+1/2)÷3/4
要列算式,打得好的,
1、2/3×5/7+2/3×2/7 2、5/6×3/8+5/8÷5/6 3、3-3/2×10/21-2/7 4、(1/2-1/3+1/6)×24
5、3/10÷(1/5+1/4)-2/3 6、2/15÷【(0.75-1/2)×2/5】 7、(4/5×5/8+1/2)÷3/4
要列算式,打得好的,
▼优质解答
答案和解析
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.
=(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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