算一算
$540 + 350 =$
$53 + 17 =$
$24 + 26 =$
$370 - 250 =$
$150 + 750 =$
$760 - 460 =$
$500 - 130 =$
$26 + 59 =$
$76 - 38 =$
$64 - 25 =$
$540 + 350 =$
$53 + 17 =$
$24 + 26 =$
$370 - 250 =$
$150 + 750 =$
$760 - 460 =$
$500 - 130 =$
$26 + 59 =$
$76 - 38 =$
$64 - 25 =$
答案
540 + 350 = 890
53 + 17 = 70
24 + 26 = 50
370 - 250 = 120
150 + 750 = 900
760 - 460 = 300
500 - 130 = 370
26 + 59 = 85
76 - 38 = 38
64 - 25 = 39
53 + 17 = 70
24 + 26 = 50
370 - 250 = 120
150 + 750 = 900
760 - 460 = 300
500 - 130 = 370
26 + 59 = 85
76 - 38 = 38
64 - 25 = 39
1. a代表一个不为0的数。
$a + a ÷ a = (\quad)$
$(a + a) ÷ a = (\quad)$
$a + a ÷ a = (\quad)$
$(a + a) ÷ a = (\quad)$
答案
1. a+1 2
2. 根据算式$103×85=8755$,直接写出下面算式的得数。
$8755÷85=(\quad\quad)$
$8755÷103=(\quad\quad)$
$8755÷85=(\quad\quad)$
$8755÷103=(\quad\quad)$
答案
103 85
3. 根据乘、除法各部分之间的关系填空。
×17=425 63×
=5544 105÷
=7
÷87=26
÷9=15 2106÷
=26
答案
25 88 15 2262 135 81
二、想一想,算一算。
$456÷ 8× 30$
$5× 6+7× 8$
$24÷ 3+36÷ 6$
$16× 2-4× 7$
$126÷ 6+35× 8$
$56÷ 4-54÷ 9$
$456÷ 8× 30$
$5× 6+7× 8$
$24÷ 3+36÷ 6$
$16× 2-4× 7$
$126÷ 6+35× 8$
$56÷ 4-54÷ 9$
答案
1710 86 14 4 301 8
三、森林医生。(对的画 “√”,错的画 “×”,并改正)

改正:
改正:
改正:
改正:
答案
1. ×
2. √
改正:150+50÷2
=150+25
=175
2. √
改正:150+50÷2
=150+25
=175
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