题目内容
20.四年级下册《四则运算》19×96-962÷74 | 10000-(59+66)×64 | 5940÷45×(798-616) |
(315×40-364)÷7 | (135+415)÷5+16 | 1200-20×18 |
735×(700-400÷25) | 150-(80+28×2) | (59+66)×64-10000 |
(798-616)-5940÷45 | 364÷7-15×40 | 12520÷8×(121÷11) |
分析 (1)先算乘法和除法,再算减法;
(2)先算加法,再算乘法,最后算减法;
(3)先算除法和减法,再算乘法;
(4)先算乘法,再算减法,最后算除法;
(5)先算小括号内的加法,再算括号外的除法,最后算加法;
(6)先算乘法,再算减法.
(7)先算小括号里面的除法,再算小括号里面的减法,最后算括号外的乘法;
(8)先算小括号里面的乘法,再算小括号里面的加法,最后算括号外的减法;
(9)先算加法,再算乘法,最后算减法;
(10)先算括号里面的减法和除法,最后算括号外面的减法;
(11)先算除法和乘法,再算减法;
(12)先算除法,再算乘法.
解答 解:(1)19×96-962÷74
=1824-13
=1811
(2)10000-(59+66)×64
=10000-125×64
=10000-8000
=2000
(3)5940÷45×(798-616)
=132×182
=24024
(4)(315×40-364)÷7
=(12600-364)÷7
=12236÷7
=1748
(5)(135+415)÷5+16
=550÷5+16
=110+16
=126
(6)1200-20×18
=1200-360
=840
(7)735×(700-400÷25)
=735×(700-16)
=735×684
=502740
(8)150-(80+28×2)
=150-(80+56)
=150-136
=14
(9)(59+66)×64-10000
=125×64-10000
=8000-10000
=-2000
(10)(798-616)-5940÷45
=182-132
=50
(11)364÷7-15×40
=52-600
=-548
(12)12520÷8×(121÷11)
=1565×11
=17215
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即可.
365000<375000 | 477万>478000 | 30050>3万 |
207548000>2亿 | 2980500000>289030000 | 465040>465039 |
782600<783500 | 151900000>9970000 | 56万>559950 |