7×7= 24÷3= 4×6= 36÷6=
56÷7= 81÷9= 6×5= 9×1=
56+7= 40-5= 70+25= 36+9=
32÷8÷2= 36÷9×7= 4×2×8= 3×8÷6=
5×9-7= 6×6+20= 7+8+9= 100-50-5=
分析:根據(jù)整數(shù)加減乘除的計(jì)算方法進(jìn)行計(jì)算.
解答:解:
7×7=49 24÷3=8 4×6=24 36÷6=6
56÷7=8 81÷9=9 6×5=30 9×1=9
56+7=63 40-5=35 70+25=95 36+9=45
32÷8÷2=2 36÷9×7=28 4×2×8=64 3×8÷6=4
5×9-7=38 6×6+20=56 7+8+9=24 100-50-5=45.
點(diǎn)評(píng):口算時(shí),注意運(yùn)算符號(hào)和數(shù)據(jù),然后再進(jìn)一步計(jì)算.
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