题目内容
计算下面各题,能简便的要用简便方法计算 150-100÷25 |
22×(23+27) | 48÷12×2 |
138+44+62 | 37×5×2 | 14×45. |
分析:(1)先算除法,再算减法;
(2)先算加法,再算乘法;
(3)先算除法,再算乘法;
(4)根据加法交换律进行简算;
(5)根据乘法结合律进行简算;
(6)14=7×2,然后再根据乘法结合律进行简算.
(2)先算加法,再算乘法;
(3)先算除法,再算乘法;
(4)根据加法交换律进行简算;
(5)根据乘法结合律进行简算;
(6)14=7×2,然后再根据乘法结合律进行简算.
解答:解:(1)150-100÷25
=150-4
=146;
(2)22×(23+27)
=22×50
=1100;
(3)48÷12×2
=4×2
=8;
(4)138+44+62
=138+62+44
=200+44
=244;
(5)37×5×2
=37×(5×2)
=37×10
=370;
(6)14×45
=(7×2)×45
=7×(2×45)
=7×90
=630.
=150-4
=146;
(2)22×(23+27)
=22×50
=1100;
(3)48÷12×2
=4×2
=8;
(4)138+44+62
=138+62+44
=200+44
=244;
(5)37×5×2
=37×(5×2)
=37×10
=370;
(6)14×45
=(7×2)×45
=7×(2×45)
=7×90
=630.
点评:此题主要考查整数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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