解题思路:(1)把46.5看作46.5×1,运用乘法分配律简算;
(2)按除法的性质简算;
(3)先算2.6÷2.6,再按计算顺序简算;
(4)先算括号中的加法,再算括号外的除法;
(5)先算小括号括号内的减法,再算中括号内的乘法,最后算括号外的除法.
(6)先算括号内的除法,再算括号内的乘法,最后算括号外的乘法.
(1)46.5×99+46.5
=46.5×(99+1)
=46.5×100
=4650
(2)12.5÷2.5÷0.4
=12.5÷(2.5×0.4)
=12.5÷1
=12.5
(3)2.6×1.9÷2.6×1.9
=2.6÷2.6×1.9×1.9
=1×1.9×1.9
=3.61
(4)(7.7+1.54)÷0.7
=9.24÷0.7
=13.2
(5)10.8÷[(4.62-1.92)×4]
=10.8÷[2.7×4]
=10.8÷10.8
=1
(6)2.6×(2.139÷9.3×6.2)
=2.6×(0.23×6.2)
=2.6×1.426
=3.7076
点评:
本题考点: 小数四则混合运算;运算定律与简便运算.
考点点评: 此题考查了小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.