题目内容

计算下面各题,能简便计算的要用简便计算.
13.6+4.5×2.2                 
4.6+8.4÷2.4
17.5÷12.5×1.4                6.4×4.5+3.6×4.5
35.6-5×1.73                  4.38÷0.125÷0.8
分析:(1)先算乘法,再算加法;
(2)先算除法,再算加法;
(3)从左往右依次计算;
(4)运用乘法分配律简算;
(5)先算乘法,再算减法;
(6)运用除法的性质简算.
解答:解:(1)13.6+4.5×2.2 
=13.6+9.9
=23.5;

(2)4.6+8.4÷2.4
=4.6+3.5
=8.1;

(3)17.5÷12.5×1.4
=1.4×1.4
=1.96;

(4)6.4×4.5+3.6×4.5
=(6.4+3.6)×4.5
=10×4.5
=45;

(5)35.6-5×1.73
=35.6-8.65
=26.95;

(6)4.38÷0.125÷0.8
=4.38÷(0.125×0.8)
=4.38÷0.1
=43.8.
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.
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