3.9×3.9,2.85×5.35+2.85×4.65,6.05÷1.25÷0.8全部简算?
2个回答
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3.9×3.9
=(4-1)×(4-1)
=4×4-1
=15
2.85×5.35+2.85×4.65
=2.85×(5.35+4.65)
=2.85×10
=28.5
6.05÷1.25÷0.8
=6.05÷(1.25×0.8)
=6.05÷1
=6.05
=(4-1)×(4-1)
=4×4-1
=15
2.85×5.35+2.85×4.65
=2.85×(5.35+4.65)
=2.85×10
=28.5
6.05÷1.25÷0.8
=6.05÷(1.25×0.8)
=6.05÷1
=6.05
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