作业帮简算：0.98*42 简算：8.4*0.26+0.27
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简算：0.98*42 简算：8.4*0.26+0.27
简算：0.98*42 简算：8.4*0.26+0.27
简算：0.98*42 简算：8.4*0.26+0.27
你好
0.98*42
=（1-0.02）*42
=1*42-0.02*42
=42-0.84
=41.16
8.4*0.26+0.27
=2.184+0.27
=2.454
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简算： 0.98*42
=(1-0.02)*42
=42-0.84
=41.16
简算：8.4*0.26+0.27
=(8+0.4)*0.26+0.27
=2.08+0.104+0.27
=2.454
0.98*42 =(1-0.02)*42 =42-0.84 =41.16
0.98*42
=(1-0.02)*42
=1*42-0.02*42
=42-0.84
=41.16
8.4*0.26+0.27
=8.4*(0.25+0.01)+0.27
=8.4*0.25+8.4*0.01+0.27
=2.1+0.084+0.27
=2.454