五年级简便运算:0.8×(3.2-2.99÷2.3) (8.1-5.4)÷3.6+85.7
4个回答
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0.8×(3.2-2.99÷2.3)
=0.8×[3.2-(2.3+0.69)÷2.3]
=0.8×(3.2-1-0.3)
=0.8×1.9
=0.8×(2-0.1)
=1.6-0.08
=1.52
(8.1-5.4)÷3.6+85.7
=0.9×(9-6)(0.9×4)+85.7
=3÷4+85.7
=0.75+85.7
=86.45
=0.8×[3.2-(2.3+0.69)÷2.3]
=0.8×(3.2-1-0.3)
=0.8×1.9
=0.8×(2-0.1)
=1.6-0.08
=1.52
(8.1-5.4)÷3.6+85.7
=0.9×(9-6)(0.9×4)+85.7
=3÷4+85.7
=0.75+85.7
=86.45
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0.8×(3.2-2.99÷2.3)
(8.1-5.4)÷3.6+85.7
=0.9×(9-6)(0.9×4)+85.7
=3÷4+85.7
=0.75+85.7
=86.45=0.8×[3.2-(2.3+0.69)÷2.3]
=0.8×(3.2-1-0.3)
=0.8×1.9
=0.8×(2-0.1)
=1.6-0.08
下次自己算
=1.52
(8.1-5.4)÷3.6+85.7
=0.9×(9-6)(0.9×4)+85.7
=3÷4+85.7
=0.75+85.7
=86.45=0.8×[3.2-(2.3+0.69)÷2.3]
=0.8×(3.2-1-0.3)
=0.8×1.9
=0.8×(2-0.1)
=1.6-0.08
下次自己算
=1.52
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=0.8×[3.2-(2.3+0.69)÷2.3]
=0.8×(3.2-1-0.3)
=0.8×1.9
=0.8×(2-0.1)
=1.6-0.08
=1.52
(8.1-5.4)÷3.6+85.7
=0.9×(9-6)(0.9×4)+85.7
=3÷4+85.7
=0.75+85.7
=86.45
=0.8×(3.2-1-0.3)
=0.8×1.9
=0.8×(2-0.1)
=1.6-0.08
=1.52
(8.1-5.4)÷3.6+85.7
=0.9×(9-6)(0.9×4)+85.7
=3÷4+85.7
=0.75+85.7
=86.45
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把小数化成分数进行运算
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