把这几题的过程写清楚(不要省略),正确采纳!
2个回答
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你好,很高兴地解答你的问题。
1.C
【解析】:
1/5+1/2×1.5×4/3
=1/5+1/2×3/2×4/3
=1/5+3/4×4/3
=1/5+1
=6/5
2.C
【解析】:
7/21×7+14/15×5/7
=49/21+70/105
=49/21+14/21
=63/21
=3
3.C
【解析】:
51×7/52
=357/52
=6又52/45
4.B
【解析】:
3.6×(3/4+5/12-7/36)
=3.6×(9/12+5/12-7/36)
=3.6×(81/108+45/108-21/108)
=3.6×(126/108-21/108)
=3.6×105/108
=3.6×35/36
=3.5
5.B
1.C
【解析】:
1/5+1/2×1.5×4/3
=1/5+1/2×3/2×4/3
=1/5+3/4×4/3
=1/5+1
=6/5
2.C
【解析】:
7/21×7+14/15×5/7
=49/21+70/105
=49/21+14/21
=63/21
=3
3.C
【解析】:
51×7/52
=357/52
=6又52/45
4.B
【解析】:
3.6×(3/4+5/12-7/36)
=3.6×(9/12+5/12-7/36)
=3.6×(81/108+45/108-21/108)
=3.6×(126/108-21/108)
=3.6×105/108
=3.6×35/36
=3.5
5.B
更多追问追答
追答
【解析】:2/9×3-0.75×2/11+3×7/9+9/11×3/4
=2/3-3/4×2/11+7/3+27/44
=2/3-6/44+7/3+27/44
=9/4
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