(2)12.53-1.35乘2-9.3 (2)0.8乘(4-3.75除)0.1 (3)13.5乘0.68除8.5 (4)20-【7.8+(6.2+1.29)】
1个回答
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(1)12.53-1.35×2-9.3
=12.53-2.7-9.3
=12.53-(2.7+9.3)
=12.53-12
=0.53
(2)0.8×(4-3.75)÷0.1
=0.8×0.25÷0.1
=0.2÷0.1
=2
(3)13.5×0.68÷8.5
=13.5÷5×(0.68÷1.7)
=2.7×0.4
=1.08
(4)20-【7.8+(6.2+1.29)】
=20-【7.8+6.2+1.29】
=20-【14+1.29】
=20-15.29
=4.71
=12.53-2.7-9.3
=12.53-(2.7+9.3)
=12.53-12
=0.53
(2)0.8×(4-3.75)÷0.1
=0.8×0.25÷0.1
=0.2÷0.1
=2
(3)13.5×0.68÷8.5
=13.5÷5×(0.68÷1.7)
=2.7×0.4
=1.08
(4)20-【7.8+(6.2+1.29)】
=20-【7.8+6.2+1.29】
=20-【14+1.29】
=20-15.29
=4.71
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