解题思路:(1)运用乘法交换律与结合律简算;
(2)先算乘法,再算减法;
(3)运用除法的性质简算;
(4)(5)运用乘法分配律简算;
(6)把32看作8×4,运用乘法结合律简算.
(1)5×1.35×0.2
=(5×0.2)×1.35
=1×1.35
=1.35
(2)56×0.76-1.9
=42.56-1.9
=40.66
(3)240÷5÷0.6
=240÷(5×0.6)
=240÷3
=80
(4)0.27×(100+1)
=0.27×100+0.27
=27+0.27
=27.27
(5)7.85×3+7.85×7
=7.85×(3+7)
=7.85×10
=78.5
(6)1.25×32×0.25
=1.25×8×4×0.25
=(1.25×8)×(4×0.25)
=10×1
=10
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.