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20×(4/5-3/4)×7/152.9×(3.8-4/5)÷(3/8+5/8)2.9×(3.8-4/5)÷(3/8+5/8)20×(4/5-3/4)×7/15(能简算的要简算
题目详情
20×(4/5-3/4)×7/15 2.9×(3.8-4/5)÷(3/8+5/8)
2.9×(3.8-4/5)÷(3/8+5/8)
20×(4/5-3/4)×7/15(能简算的要简算
2.9×(3.8-4/5)÷(3/8+5/8)
20×(4/5-3/4)×7/15(能简算的要简算
▼优质解答
答案和解析
20×(4/5-3/4)×7/15
=(20x4/5-20x3/4)x7/15
=(16-15)x7/15
=1x7/15
=7/15
2.9×(3.8-4/5)÷(3/8+5/8)
=2.9x3÷1
=8.7
=(20x4/5-20x3/4)x7/15
=(16-15)x7/15
=1x7/15
=7/15
2.9×(3.8-4/5)÷(3/8+5/8)
=2.9x3÷1
=8.7
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