题目内容
计算: (48+66)÷6 | (126-48)÷6 | 48÷(8+16) |
48×102 | 37×99 | 1016÷8 |
29×(1008÷8-49×18÷7÷6)+40×8 |
考点:整数四则混合运算
专题:运算顺序及法则
分析:(1)(2)(6)类比乘法分配律简算;
(3)先算加法,再算除法;
(4)(5)利用乘法分配律简算;
(7)先算括号里面的乘法和除法,再算括号外面的乘法,最后算加法.
(3)先算加法,再算除法;
(4)(5)利用乘法分配律简算;
(7)先算括号里面的乘法和除法,再算括号外面的乘法,最后算加法.
解答:
解:(1)(48+66)÷6
=48÷6+66÷6
=8+11
=19;
(2)(126-48)÷6
=126÷6-48÷6
=21-8
=13;
(3)48÷(8+16)
=48÷24
=2;
(4)48×102
=48×(100+2)
=48×100+48×2
=4800+96
=4896;
(5)37×99
=37×(100-1)
=37×100-37
=3700-37
=3663;
(6)1016÷8
=(1000+16)
=1000÷8+16÷8
=125+2
=127;
(7)29×(1008÷8-49×18÷7÷6)+40×8
=29×(126-21)+40×8
=29×105+40×8
=3045+320
=3365.
=48÷6+66÷6
=8+11
=19;
(2)(126-48)÷6
=126÷6-48÷6
=21-8
=13;
(3)48÷(8+16)
=48÷24
=2;
(4)48×102
=48×(100+2)
=48×100+48×2
=4800+96
=4896;
(5)37×99
=37×(100-1)
=37×100-37
=3700-37
=3663;
(6)1016÷8
=(1000+16)
=1000÷8+16÷8
=125+2
=127;
(7)29×(1008÷8-49×18÷7÷6)+40×8
=29×(126-21)+40×8
=29×105+40×8
=3045+320
=3365.
点评:整数混合运算的关键是抓住运算顺序,正确按运算顺序计算,适当利用运算定律简算.
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