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递等式计算(能简算的要简算)4.65-2.55-1.456.4÷(0.3×2+0.2)201×6.5-6.52.2×0.25+2.8×0.25.
题目详情
递等式计算(能简算的要简算)
4.65-2.55-1.45 | 6.4÷(0.3×2+0.2) | 201×6.5-6.5 | 2.2×0.25+2.8×0.25. |
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答案和解析
解;①4.65-2.55-1.45,
=4.65-(2.55+1.45),
=4.65-4,
=0.65;
②6.4÷(0.3×2+0.2),
=6.4÷(0.6+0.2),
=6.4÷0.8,
=8;
③201×6.5-6.5,
=6.5×(201-1),
=0.65×200,
=130;
④2.2×0.25+2.8×0.25,
=0.25×(2.2+2.8),
=0.25×5,
=1.25.
=4.65-(2.55+1.45),
=4.65-4,
=0.65;
②6.4÷(0.3×2+0.2),
=6.4÷(0.6+0.2),
=6.4÷0.8,
=8;
③201×6.5-6.5,
=6.5×(201-1),
=0.65×200,
=130;
④2.2×0.25+2.8×0.25,
=0.25×(2.2+2.8),
=0.25×5,
=1.25.
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