题目内容
计算下面各题,能简算的请简算.
95.6×1.8+0.18×44
87.5÷12.5÷8
0.125+3.7×
+
×5.3
0.25×64×1.25
83×101
7.7×7+7.7+2×7.7.
95.6×1.8+0.18×44
87.5÷12.5÷8
0.125+3.7×
1 |
8 |
1 |
8 |
0.25×64×1.25
83×101
7.7×7+7.7+2×7.7.
分析:(1)运用乘法的分配律进行简算;
(2)运用除法的性质进行简算;
(3)运用乘法的分配律进行简算;
(4)把64化成8×8,再乘法的结合律进行简算;
(5)运用乘法的分配律进行简算;
(6)运用乘法的分配律进行简算.
(2)运用除法的性质进行简算;
(3)运用乘法的分配律进行简算;
(4)把64化成8×8,再乘法的结合律进行简算;
(5)运用乘法的分配律进行简算;
(6)运用乘法的分配律进行简算.
解答:解:(1)95.6×1.8+0.18×44
=956×0.18+0.18×44
=(956+44)×0.18
=1000×0.18
=180;
(2)87.5÷12.5÷8
=87.5÷(12.5×8)
=87.5÷100
=0.875;
(3)0.125+3.7×
+
×5.3
=
×(1+3.7+5.3)
=
×10
=1.25;
(4)0.25×64×1.25
=0.25×8×8×1.25
=(0.25×8)×(8×1.25)
=2×10
=20;
(5)83×101
=83×(100+1)
=83×100+83×1
=8300+83
=8383;
(6)7.7×7+7.7+2×7.7
=7.7×(7+1+2)
=7.7×10
=77.
=956×0.18+0.18×44
=(956+44)×0.18
=1000×0.18
=180;
(2)87.5÷12.5÷8
=87.5÷(12.5×8)
=87.5÷100
=0.875;
(3)0.125+3.7×
1 |
8 |
1 |
8 |
=
1 |
8 |
=
1 |
8 |
=1.25;
(4)0.25×64×1.25
=0.25×8×8×1.25
=(0.25×8)×(8×1.25)
=2×10
=20;
(5)83×101
=83×(100+1)
=83×100+83×1
=8300+83
=8383;
(6)7.7×7+7.7+2×7.7
=7.7×(7+1+2)
=7.7×10
=77.
点评:本题主要考查了学生在四则混合运算中灵活运用简便算法的计算能力.
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