题目内容
递等式计算(能巧算的要巧算) 8.8×1.01 |
6.72÷(4.8×0.5) | 1000÷1.25×8 |
8400÷2.5÷0.4 | 125.7×18.5-25.7×18.5 | 0.35×(12+3.96÷18) |
分析:(1)利用乘法分配律进行简算,把1.01分解为(1+0.01),以此解答
(2)先算小括号里的,再算除法;
(3)按照从左向右的顺序进行计算;
(4)运用除法的性质进行解答;
(5)运用乘法分配律进行解答;
(6)先算小括号里的除法,再算小括号里的加法,最后算括号外的乘法.
(2)先算小括号里的,再算除法;
(3)按照从左向右的顺序进行计算;
(4)运用除法的性质进行解答;
(5)运用乘法分配律进行解答;
(6)先算小括号里的除法,再算小括号里的加法,最后算括号外的乘法.
解答:解:(1)8.8×1.01
=8.8×(1+0.01)
=8.8×1+8.8×0.01
=8.888;
(2)6.72÷(4.8×0.5)
=6.72÷2.4
=2.8;
(3)1000÷1.25×8
=800×8
=6400;
(4)8400÷2.5÷0.4
=8400÷(2.5×0.4)
=8400÷1
=8400;
(5)125.7×18.5-25.7×18.5
=(125.7-25.7)×18.5
=100×18.5
=1850;
(6)0.35×(12+3.96÷18)
=0.35×(12+0.22)
=0.35×12.22
=4.277.
=8.8×(1+0.01)
=8.8×1+8.8×0.01
=8.888;
(2)6.72÷(4.8×0.5)
=6.72÷2.4
=2.8;
(3)1000÷1.25×8
=800×8
=6400;
(4)8400÷2.5÷0.4
=8400÷(2.5×0.4)
=8400÷1
=8400;
(5)125.7×18.5-25.7×18.5
=(125.7-25.7)×18.5
=100×18.5
=1850;
(6)0.35×(12+3.96÷18)
=0.35×(12+0.22)
=0.35×12.22
=4.277.
点评:本题考查了简单的四则混合运算,计算时先理清楚运算顺序,根据运算顺序逐步求解即可,能简算的运用简便方法计算.
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