计算下面各题,能用简便方法的要用简便方法计算.1.25×32×2.57.54-0.9×6-2.3610.1×3.48÷0.9÷4.17.28+27.2÷43.6×5

发布时间:2020-07-30 22:08:26

计算下面各题,能用简便方法的要用简便方法计算. 1.25×32×2.57.54-0.9×6-2.3610.1×3.48÷0.9÷4.17.28+27.2÷43.6×5.2+4.8×3.6.

网友回答

解:(1)1.25×32×2.5,
=1.25×8×4×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;

(2)7.54-0.9×6-2.36,
=7.54-5.4-2.36,
=2.41-2.36,
=0.05;

(3)10.1×3.4,
=(10+0.1)×3.4,
=34+0.34,
=34.34;

(4)8÷0.9÷4.1,
=8÷(0.9×4.1),
=8÷3.69,
=;

(5)7.28+27.2÷4,
=7.28+6.8,
=14.08;

(6)3.6×5.2+4.8×3.6,
=3.6×(5.2+4.8),
=3.6×10,
=36.

解析分析:(1)把32看作8×4,运用乘法结合律简算;(2)先算乘法,再算减法;(3)把10.1看作10+0.1,运用乘法分配律简算;(4)运用除法的性质简算;(5)先算除法,再算加法;(6)运用乘法分配律简算.

点评: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律简便计算.
以上问题属网友观点,不代表本站立场,仅供参考!