三年级脱式计算题答案2089-25×13 3.2+45.5+29.6

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三年级脱式计算题答案2089-25×13                  3.2+45.5+29.6

三年级脱式计算题答案2089-25×13 3.2+45.5+29.6
三年级脱式计算题答案
2089-25×13 3.2+45.5+29.6

三年级脱式计算题答案2089-25×13 3.2+45.5+29.6
2089-25×13
=2089-25x3-25x10
=2089-75-250
=2014-250
=1764
3.2+45.5+29.6
=48.7+30-0.4
=78.7-0.4
=78.3

2089-25×13
=2089-25x12-25
=2089-25x4x3-25
=2089-300-25
=1789-25
=1764
3.2+45.5+29.6
=3+45.5+29.8
=48.5+30-0.2
=78.5-1.2
=78.3