脱式计算(能简算的要简算)3÷34-34÷3+33499×8798217+118×59+3858×5.3+5.7×58-0.625[(735×35+225÷123)÷13]÷13.
脱式计算(能简算的要简算) 3÷-÷3+3 | 99× | 2+1×+ |
×5.3+5.7×-0.625 | [(7×+2÷1)÷]÷. |
答案和解析
(1)3÷
-÷3+3,
=4-+3,
=3+3,
=7;
(2)99×,
=(98+1)×,
=98×+1×,
=87+,
=87,
(3)2+1×+,
=2++,
=2+(+),
=2+1,
=3;
(4)×5.3+5.7×-0.625,
=×5.3+5.7×-,
=(5.3+5.7-1)×,
=10×,
=;
(5)[(7×+2÷1)÷]÷,
=[(7×+2×)÷]÷,
=[(7+2)×÷]÷,
=[10×÷]÷,
=[6÷]÷,
=18÷,
=54.
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