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(3.8-1.8除以2)乘以0.5 简便运算
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(3.8-1.8除以2)乘以0.5
=3.8*0.5-1.8÷2*0.5
=1.9-0.45
=1.45
或(3.8-1.8除以2)乘以0.5
=(3.8-0.9)*0.5
=2.9*0.5
=(2+0.9)*0.5
=1+0.45
=1.45
=3.8*0.5-1.8÷2*0.5
=1.9-0.45
=1.45
或(3.8-1.8除以2)乘以0.5
=(3.8-0.9)*0.5
=2.9*0.5
=(2+0.9)*0.5
=1+0.45
=1.45
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