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能简算的要简算.8.37×0.2+8.37×2.80.98×1012.8×0.25+0.7517.23-4.81-5.19.
题目详情
能简算的要简算.
8.37×0.2+8.37×2.8 | 0.98×101 | 2.8×0.25+0.75 | 17.23-4.81-5.19. |
▼优质解答
答案和解析
(1)8.37×0.2+8.37×2.8,
=8.37×(0.2+2.8),
=8.37×3,
=25.11;
(2)0.98×101,
=0.98×(100+1),
=0.98×100+0.98×1,
=98+0.98,
=98.98;
(3)2.8×0.25+0.75,
=0.7×4×0.25+0.75,
=0.7×(4×0.25)+0.75,
=0.7×1+0.75,
=0.7+0.75,
=1.45;
(4)17.23-4.81-5.19,
=17.23-(4.81+5.19),
=17.23-10,
=7.23;
=8.37×(0.2+2.8),
=8.37×3,
=25.11;
(2)0.98×101,
=0.98×(100+1),
=0.98×100+0.98×1,
=98+0.98,
=98.98;
(3)2.8×0.25+0.75,
=0.7×4×0.25+0.75,
=0.7×(4×0.25)+0.75,
=0.7×1+0.75,
=0.7+0.75,
=1.45;
(4)17.23-4.81-5.19,
=17.23-(4.81+5.19),
=17.23-10,
=7.23;
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