题目内容

口算下面各题:
3×3=
8×6= 5×7= 88+8=
3×6= 8×7= 6×5= 67-40=
8+37= 48-7= 32-8= 40+28=
8×2= 4×9= 41-2= 5×8+20=
38-18+25= 6×4-10=
分析:5×8+20先算乘法,再算加法;38-18+25先算减法,再算加法;6×4-10先算乘法,再算减法;其它题目根据运算法则直接求解.
解答:解:
3×3=9, 8×6=48, 5×7=35, 88+8=96,
3×6=18, 8×7=56, 6×5=30, 67-40=27,
8+37=45, 48-7=41, 32-8=24, 40+28=68,
8×2=16, 4×9=36, 41-2=39, 5×8+20=60,
38-18+25=45, 6×4-10=14.
故答案为:9,48,35,96,18,56,30,27,45,41,24,68,16,36,39,60,45,14.
点评:本题考查了基本的计算,计算时要细心,注意运算的顺序.
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