来自范辉的问题
2.4×7.06-8-5.75.2×10.11.83+3.79+0.172.5×7.1×41.5×9.9+0.754.8-4.8×0.5(8+0.8)×1.25198×0.51
2.4×7.06-8-5.7 5.2×10.1 1.83+3.79+0.17 2.5×7.1×41.5×9.9+0.75 4.8-4.8×0.5 (8+0.8)×1.25 198×0.51


2.4×7.06-8-5.75.2×10.11.83+3.79+0.172.5×7.1×41.5×9.9+0.754.8-4.8×0.5(8+0.8)×1.25198×0.51
2.4×7.06-8-5.7 5.2×10.1 1.83+3.79+0.17 2.5×7.1×41.5×9.9+0.75 4.8-4.8×0.5 (8+0.8)×1.25 198×0.51
(1)2.4×7.06-8-5.7
=169.44-8-5.7
=161.44-5.7
=155.74;
(2)5.2×10.1
=5.2×(10+0.1)
=52+0.52
=52.52;
(3)1.83+3.79+0.17
=1.83+0.17+3.79
=2+3.79
=5.79;
(4)2.5×7.1×4
=2.5×4×7.1
=10×7.1
=71;
(5)1.5×9.9+0.75
=1.5×(10-0.1)+0.75
=15-0.15+0.75
=14.85+0.75
=15.6;
(6)4.8-4.8×0.5
=(1-0.5)×4.8
=0.5×4.8
=2.4;
(7)(8+0.8)×1.25
=8×1.25+0.8×1.25
=10+1
=11;
(8)198×0.51
=(200-2)×0.51
=200×0.51-2×0.51
=102-1.02
=100.98.