问题
解答题
脱式计算.(能简算的要简算)
2.14×15.4+0.46×21.4
8.05÷3.5×1.5-3
140÷1.25÷0.8
100.7-(75+9.6÷0.4)
答案
(1)2.14×15.4+0.46×21.4,
=2.14×15.4+4.6×2.14,
=2.14×(15.4+4.6),
=2.14×20,
=42.8;
(2)8.05÷3.5×1.5-3,
=2.3×1.5-3,
=3.45-3,
=0.45;
(3)140÷1.25÷0.8,
=140÷(1.25×0.8),
=140÷1,
=140;
(4)100.7-(75+9.6÷0.4),
=100.7-(75+24),
=100.7-99,
=1.7.