考点:小数四则混合运算,运算定律与简便运算
专题:运算顺序及法则
分析:(1)先把10.1分解成10+10.1,再运用乘法分配律简算;
(2)先算小括号里面的乘法,再算括号外的除法;
(3)先算乘法,再算减法;
(4)运用除法的性质简算;
(5)先把4.8分解成1.2×4,再运用乘法结合律简算;
(6)运用乘法分配律简算.
解答:
解:(1)23.6×10.1
=23.6×(10+0.1)
=23.6×10+23.6×0.1
=236+2.36
=238.36;
(2)26.88÷(1.6×0.14)
=26.88÷0.224
=120;
(3)50.4×1.9-1.8
=95.76-1.8
=93.96;
(4)80.69÷0.125÷0.8
=80.96÷(0.125×0.8)
=80.96÷0.1
=809.6;
(5)4.8×0.25
=1.2×4×0.25
=1.2×(4×0.25)
=1.2×1
=1.2;
(6)6.4×17.6+0.64×24
=6.4×17.6+6.4×2.4
=6.4×(17.6+2.4)
=6.4×20
=128.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.