口算 25+64=78-36=2100+500=0+98=32×5=2×23=26+41=45÷3=66÷6=39+38=72-23=1740-800=72÷4=32×3=100-54=24÷2=
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解:25+64=89,78-36=42,2100+500=2600,0+98=98,32×5=160,2×23=46,26+41=67,45÷3=15,66÷6=11,39+38=77,72-23=49,1740-800=940,72÷4=18,32×3=96,100-54=46,24÷2=12.故