计算.能简算的要简算 并写出简算过程.(1)(0.12+0.22+0.32+0.42)2÷(0.13+0.23+0.33+0.43)(2)3.97÷7+17×4.03-
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| 计算.能简算的要简算,并写出简算过程. (1)(0.12+0.22+0.32+0.42)2÷(0.13+0.23+0.33+0.43) (2)3.97÷7+ (3)0.0021×[1 (4)0.125×0.25×0.5×64 (5)4936×(0.75×42.7-0.573×25+57.3)÷3. |
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(1)(0.12+0.22+0.32+0.42)2÷(0.13+0.23+0.33+0.43),
=(0.01+0.04+0.09+0.16)2÷(0.001+0.008+0.027+0.064),
=0.32÷0.1,
=0.09÷0.1,
=0.9;(2)3.97÷7+17×4.03-17,
=3.97×17+17×4.03-17,
=(3.97+4.03-1)×17,
=7×17,
=1;(3)0.0021×[167+2.93÷(1123-1.9)]÷0.001,
=0.0021×[167+293100÷92330]÷0.001,
=0.0021×[167+293100×30293]÷0.001,
=0.0021×[167+310]÷0.001,
=0.0021×15170÷0.001,
=0.00453÷0.001,
=4.53;(4)0.125×0.25×0.5×64,
=0.125×0.25×0.5×8×4×2,
=(0.125×8)×(0.25×4)×(0.5×2),
=1×1×1,
=1;(5)4936×(0.75×42.7-0.573×25+57.3)÷3.
=4936×(32.025-14.325+57.3)÷3,
=4936×75÷3,
=370200÷3,
=123400.
