题目内容
脱式计算. 3.68-0.82-0.18 |
3.4÷2.5÷0.4 | ||||
3.27×99+32.7 | [1-(
|
分析:(1)运用减法的性质简算;
(2)运用除法的性质简算;
(3)把原式变为3.27×99+3.27×10,运用乘法分配律简算为3.27×109,把109看作(100+10-1),再次运用乘法分配律简算;
(4)先算小括号内的,再算中括号内的,最后算括号外的.
(2)运用除法的性质简算;
(3)把原式变为3.27×99+3.27×10,运用乘法分配律简算为3.27×109,把109看作(100+10-1),再次运用乘法分配律简算;
(4)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)3.68-0.82-0.18
=3.68-(0.82+0.18)
=3.68-1
=2.68;
(2)3.4÷(2.5×0.4)
=3.4÷1
=3.4;
(3)3.27×99+32.7
=3.27×99+3.27×10
=3.27×(99+10)
=3.27×109
=3.27×(100+10-1)
=3.27×100+3.27×10-3.27
=327+32.7-3.27
=327+(32.7-3.27)
=327+29.43
=356.43;
(4)[1-(
+
)]×36
=[1-
]×36
=
×36
=6.
=3.68-(0.82+0.18)
=3.68-1
=2.68;
(2)3.4÷(2.5×0.4)
=3.4÷1
=3.4;
(3)3.27×99+32.7
=3.27×99+3.27×10
=3.27×(99+10)
=3.27×109
=3.27×(100+10-1)
=3.27×100+3.27×10-3.27
=327+32.7-3.27
=327+(32.7-3.27)
=327+29.43
=356.43;
(4)[1-(
1 |
2 |
1 |
3 |
=[1-
5 |
6 |
=
1 |
6 |
=6.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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