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1. 比一比，算一算。
$6 + 7 =$ $15 - 8 =$
$60 + 70 =$ $150 - 80 =$
$600 + 700 =$ $1500 - 800 =$
$6 + 7 =$ $15 - 8 =$
$60 + 70 =$ $150 - 80 =$
$600 + 700 =$ $1500 - 800 =$
答案：
2. $40 + 90 =$ $60 + 50 =$ $70 + 40 =$
$130 - 40 =$ $110 - 60 =$ $110 - 70 =$
$130 - 90 =$ $110 - 50 =$ $110 - 40 =$
$130 - 40 =$ $110 - 60 =$ $110 - 70 =$
$130 - 90 =$ $110 - 50 =$ $110 - 40 =$
答案：
3.
(1) 苹果和菠萝一共有多少个？
(2) 梨卖掉多少个就和苹果同样多？
(1) 苹果和菠萝一共有多少个？
(2) 梨卖掉多少个就和苹果同样多？
答案：
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