问题
解答题
用简便方法计算.
6.74+12.62+24.38+3.26
(125+9)×8
32×38+32×62
99×66+66.
答案
(1)6.74+12.62+24.38+3.26
=(6.74+3.26)+(12.62+24.38)
=10+37
=47;
(2)(125+9)×8
=125×8+9×8
=1000+72
=1072;
(3)32×38+32×62
=32×(38+62)
=32×100
=3200;
(4)99×66+66
=66×(99+1)
=66×100
=6600.