用脱式计算,能简便就简便。 20
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11.4+1.25×2.4
=11.4+1.25×2+1.25×0.4
=11.4+2.5+0.5
=11.4+3
=14.4
2.3+3.91÷(22-19.7)
=2.3+3.91÷2.3
=2.3+1.7
=4
(455-12.5×4)÷8.1
(455-50)÷8.1
=405÷9÷0.9
=45÷0.9
=50
0.8×[13-(3.12+5.28)]
=0.8×(13-8.4)
=0.8×4.6
=0.8×(5-0.4)
=0.8×5-0.8×0.4
=4-0.32
=3.68
=11.4+1.25×2+1.25×0.4
=11.4+2.5+0.5
=11.4+3
=14.4
2.3+3.91÷(22-19.7)
=2.3+3.91÷2.3
=2.3+1.7
=4
(455-12.5×4)÷8.1
(455-50)÷8.1
=405÷9÷0.9
=45÷0.9
=50
0.8×[13-(3.12+5.28)]
=0.8×(13-8.4)
=0.8×4.6
=0.8×(5-0.4)
=0.8×5-0.8×0.4
=4-0.32
=3.68
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