2.9-0.11+6.5X2.4简便计算
4个回答
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2.9-0.11+6.5X2.4
=2.9-0.11+6.5x(2+0.4)
=2.9-0.11+13+2.6
=2.9+2.6+13-0.11
=18.5-0.11
=18.39
=2.9-0.11+6.5x(2+0.4)
=2.9-0.11+13+2.6
=2.9+2.6+13-0.11
=18.5-0.11
=18.39
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原式
= 2.9 - 0.1 -0.01 + 13/2 x 12/5
= 2.8-0.01 + 13x6 / 5
= 2.8 + 78/5- 0.01
= 2.8+ 156/10- 0.01
= 2.8+ 15.6 - 0.01
= 18.4 -0.01
= 18.39
= 2.9 - 0.1 -0.01 + 13/2 x 12/5
= 2.8-0.01 + 13x6 / 5
= 2.8 + 78/5- 0.01
= 2.8+ 156/10- 0.01
= 2.8+ 15.6 - 0.01
= 18.4 -0.01
= 18.39
追问
那哪里来的13除以2,12除以5
追答
6.5=13/2 2.4=12/5
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