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2.5 △ 1.25 △ 0.4
2.5÷（1.25÷0.4）
=2.5÷1.25×0.4
=2×0.4
=0.8
It is convenient to calculate 23 / 25 × 1 / 4 + 1 / 4 × 2 / 25
23 / 25 × 1 / 4 + 1 / 4 × 2 / 25
=1/4(23/25+2/25)
=1/4*1
=1/4
Simple calculation of (2.5 + 1.25 + 0.075) × 4
（2.5+1.25+0.075)×4
=2.5×4+1.25×4+0.075×4
=10+5+0.3
=15.3
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