3×（215+112）-25[12-（34-35）]÷7104.5×3.7+412×1.349÷[225-（15+13）]34×95-34÷1013425×170%+6.3×425-2.5．-六年级数学
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=
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=
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=0+
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=
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（2）[
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=[
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=
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=
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（3）4.5×3.7+4
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=4.5×（3.7+1.3），
=4.5×5，
=22.5；
（4）
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