数学问题mathematicalproblem数学作业arithmeticoperation数学计算mathematicalcomputation数学定义mathematicaldefinition数学方法mathematicalmethod数学关系mathematicrelation;mathematicalrelation数学关系式relationship加:plusadd减:subtractminussum和乘:multiply除:dividemultiplyinstruction乘法指令multiplydivide乘除法multiplication乘法naturalnumber自然数negativenumber负数properfraction真分数total1.总数(用于加法中,相当于+)2.总计(用于减法中,相当于-)等于:isequalto不等于:isnotequalto大于:isgreaterthan小于:islessthan=:isgreaterthanorequalto(或nolessthan)=:islessthanorequalto(或nomorethan)把这些数字加起来,我们就可以找到。(Addingthesefiguresupwecanfindtheanswer)6乘以9得多少?(Whatdoyougetifyoumultiplysixbynine?)这名小学生能做加法和减法,但还没学会做除法。(Thepupilcouldaddandsubtract,buthadn'tlearnedtodivide.)decimal小数decimalpoint小数点decreased减少decreaseto减少到decreaseby减少了denominator分母dividend被除数dividedevenly被除数divisible可整除的division1.除divisor除数factor因子fraction分数numerator分子denominator分母twodigits2位units'digit个位3digitsnumber三位数carrydigit进位数scratchpaper草稿纸compute计算arithmeticexercises算术练习Bracket括号PEPedition人教版kilogram千克multiple倍数average平均Square正方形triangle三角形polygon多边形product乘积centimeter厘米Location位置direction方向unit单元thefourfundamentaloperationsofarithmetic四则运算四则运算定律加法交换律:a+b=b+a,加法结合律:(a+b)+c=a+(b+c)乘法交换律:ab=ba,乘法结合律:(ab)c=a(bc)乘法分配律:(a±b)c=ac±bc.运算性质①减法的基本性质:a-(b+c)=a-b-ca-b-c=a-(b+c)②除法的基本性质:a÷b÷c=a÷(b×c)(a±b)÷c=a÷c±b÷c