ï¼1ï¼ï¼1.6+1.6+1.6+1.6ï¼Ã25
=1.6x4x25
=1.6x(4x25)
=1.6x100
=160
ï¼2ï¼ååäºåä¹äºï¼ï¼2.5+1.9ï¼Ãï¼0.5â0.5ï¼
=ååäºåä¹äºï¼ï¼2.5+1.9ï¼Ã0
=ååäºåä¹äºï¼0
=ååäºåä¹äº
ï¼3ï¼ååäºåä¹äºï¼2.5+1.9Ãï¼0.5-0.5ï¼
=ååäºåä¹äºï¼2.5+1.9Ã0
=ååäºåä¹äºï¼0
=ååäºåä¹äº
ï¼4ï¼ååäºåä¹äºï¼2.5+1.9Ã0.5â0.5
=4.4-2.5-0.95-0.5
=4.4-(2.5+0.5)-(1-0.05)
=4.4-3-1+0.05
=0.4+0.05
=0.45
ï¼5ï¼[ååäºåä¹äºï¼ï¼2.5+1.9Ã0.5ï¼]â0.5
=[4.4ï¼ï¼2.5+0.95ï¼]â0.5
=4.4-2.5-0.95-0.5 ï¼ è·ï¼4ï¼ä¸æ ·äº ï¼
=0.45
ï¼6ï¼[ååäºåä¹äºâï¼2.5+1.9ï¼]Ãï¼0.5â0.5ï¼
=[ååäºåä¹äºâï¼2.5+1.9ï¼]Ã0
=0
ï¼7ï¼[ååäºåä¹äºâï¼2.5+1.9ï¼Ã0.5]â0.5
=[4.4-4.4Ã0.5]â0.5
=[4.4-2.2]â0.5
=2.2-0.5
=1.7
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