【3.94+0.86】*0.8 0.7*【3.2-2.99/2.3】 0.37*2.6+7.4*0.37 0.25*6.
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【3.94+0.86】*0.8

=【4+0.8】*0.8

=3.2+0.64

3.84

0.7*【3.2-2.99/2.3】

=0.7*【3.2-1.3】

=0.7*(2-0.1)

=1.4-0.07

=1.33

0.37*2.6+7.4*0.37

= 0.37*(2.6+7.4)

= 0.37*10

=3.7

0.25*6.4/1.6*4.8

= 0.25*1.6*4/1.6*4.8

=1/4.8

=5/24

【8.1-5.4】/1.8+45.7

=2.7/1.8+45.7

=1.5+45.7

=47.2

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