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简便运算 ① 7/25×101-7/25 ②(5/6+7/8-5/12)÷1/2 ③ 75%×3/7+1/7×3/4+3

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/15 19:00:17
简便运算 ① 7/25×101-7/25 ②(5/6+7/8-5/12)÷1/2 ③ 75%×3/7+1/7×3/4+3/7×0.75 = = =
① 7/25×101-7/25
=7/25×(101-1)
=7/25×100
=28
②(5/6+7/8-5/12)÷1/2
=(5/6+7/8-5/12)×2
=5/6×2+7/8×2-5/12×2
=5/3-5/6+7/4
=5/6+7/4
=10/12+21/12
=31/12
③ 75%×3/7+1/7×3/4+3/7×0.75
=0.75×(3/7+1/7+3/7)
=0.75×1
=0.75
再问: 弄错了! ②(5/6+7/8-5/12)÷1/24 =