题目内容
怎样简便就怎样算.
4.27÷0.7×1.3
18.9-18.9÷1.4
8×4.6+3.5×8+4.4×8
0.25×1.25×0.16
6.96×9.9
12.5×1.7+9.3×12.5-12.5.
4.27÷0.7×1.3
18.9-18.9÷1.4
8×4.6+3.5×8+4.4×8
0.25×1.25×0.16
6.96×9.9
12.5×1.7+9.3×12.5-12.5.
分析:(1)从左往右依次运算;
(2)先算除法,再算减法;
(3)(6)运用乘法分配律简算;
(4)把0.16看作8×0.2,运用乘法交换律与结合律简算;
(5)把9.9看作10-0.1,运用乘法分配律简算.
(2)先算除法,再算减法;
(3)(6)运用乘法分配律简算;
(4)把0.16看作8×0.2,运用乘法交换律与结合律简算;
(5)把9.9看作10-0.1,运用乘法分配律简算.
解答:解:(1)4.27÷0.7×1.3
=6.1×1.3
=7.93;
(2)18.9-18.9÷1.4
=18.9-13.5
=5.4;
(3)8×4.6+3.5×8+4.4×8
=8×(4.6+3.5+4.4)
=8×12.5
=100;
(4)0.25×1.25×0.16
=0.25×12.5×8×0.2
=(0.25×0.2)×(12.5×8)
=0.05×100
=5;
(5)6.96×9.9
=6.96×(10-0.1)
=6.96×10-6.96×0.1
=69.6-0.696
=68.904;
(6)12.5×1.7+9.3×12.5-12.5
=12.5×(1.7+9.3-1)
=12.5×10
=125.
=6.1×1.3
=7.93;
(2)18.9-18.9÷1.4
=18.9-13.5
=5.4;
(3)8×4.6+3.5×8+4.4×8
=8×(4.6+3.5+4.4)
=8×12.5
=100;
(4)0.25×1.25×0.16
=0.25×12.5×8×0.2
=(0.25×0.2)×(12.5×8)
=0.05×100
=5;
(5)6.96×9.9
=6.96×(10-0.1)
=6.96×10-6.96×0.1
=69.6-0.696
=68.904;
(6)12.5×1.7+9.3×12.5-12.5
=12.5×(1.7+9.3-1)
=12.5×10
=125.
点评:此题考查了运算定律与简便运算,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.
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