先确定符号，绝对值再相乘米所以两天水位共上升米所以经过天,水位共下降了米‹›‹›个数与相乘，所得的积是这个数的相反数‹›‹›‹›三个有理数相乘，可以任意交换因数的位置，或者先把原式解练习‹›‹›‹›‹›‹›‹›‹›解米›例解原式正‹›‹›有理数的除法法则‹›例解原式青岛版七年级数学上册.有理数的乘法和除法张.文档免费在线阅读例例题几个不等于的数相乘，积的符号由负因数的个数决定练习‹›例例题‹›例例题几个不等于的数相乘，积的符号由负因数的个数决定当负因数有奇数个时，积为负当负因数有偶数个时，积为正多个有理数相乘，可以先确定积的符号，再把各因数的绝对值相乘几个有理数相乘，有个因数是，积就为‹›例解原式先确定符号，绝对值再相乘乘法交换律乘法结合律‹›因数的绝对值相乘几个有理数相乘，有个因数是，积就为‹›练习‹›例例题‹›乘法结合律‹›‹›三个有理数相个不等于的数相乘，积的符号由负因数的个数决定当负因数有奇数个时，积为负当负因例解原式先确定符号，绝对值再相乘乘法交换律个因数是，积就为‹›例解原式乘法结合律‹›数有偶数个时，积为正多个有理数相乘，可以先确定积的符号，再把各因数的绝对值相乘几个有理数相乘，有交换因数的位置，或者先把其中的两个因数相乘个数同两个数的和相乘，等于把这个数分别与这两个数相乘，就为几个不等于的数相乘，积的符号由负因数的个数决定当负因数有奇数个时，积为负当负因数有偶数个时，积为‹›三个有理数相乘，可以任意‹›三个有理数相个不等于的数相乘，积的符号由负因数的个数决定当负因数有奇数个时，积为负当负因例解原式先确定符号，绝对值再相乘乘法交换律数的绝对值相乘几个有理数相乘，有个因数是，积就为‹›相乘，所得的积是这个数的相反数‹›‹›‹›三个有理数相乘，可以任意交换因数的位置，或者先把原式解练习‹›‹›‹›‹›‹›‹›‹›解练习‹›例其中的两个因数相乘个数同两个数的和相乘，等于把这个数分别与这两个数相乘，再把积相加‹›例例题‹›乘法交换律乘法结合律练习‹›例其中的两个因数相乘个数同两个数的和相乘，等于把这个数分别与这两个数相乘，再把积相加‹›例解原式先确定符号，绝对值再相乘米所以两天水位共上升米所以经过天,水位共下降了米‹›‹›个数与相乘，所得的积是这个数的相反数‹›‹›‹›三个有理数相乘，可以任意交换因数的位置，或者先把原式解练习‹›‹›‹›‹›‹›‹›‹›解米›例解原式正‹›‹›有理数的除法法则‹›例解原式练习，积就为‹›例解原式先确定符号，绝对值再相乘乘法交换律乘法，积就为‹›例解原式先确定符号，绝对值再相乘乘法交换律乘法，积就为‹›例解原式先确定符号，绝对值再相乘乘法交换律乘法例例题几个不等于的数相乘，积的符号由负因数的个数决定当负因数有奇数个时，积为负当负因数有偶数个时，积为正多个有理数相乘，可以先确定积的符号，再把各因数的绝对值相乘几个有理数相乘，有个因数是乘法分配律练习‹›例例题‹›乘法交换律乘法结合律练习‹›例其中的两个因数相乘个数同两个数的和相乘，等于把这个数分别与这两个数相乘，再把积相加‹›例解原式先确定符号，绝对值再相乘米所以两天水位共上升米所以经过天,水位共下降了米‹›‹›个数与相乘，所得的积是这个数的相反数‹›‹›‹›三个有理数相乘，可以任意交换因数的位置，或者先把原式解练习‹›‹›‹›‹›‹›‹›‹›解米›例解原式正‹›‹›有理数的除法法则‹›例解原式练习‹把积相加多个有理数相乘，可以先确定积的符号，再把各因数的绝对值相乘几个有理数相乘，有个因数是，积就为几个不等于的数相乘，积的符号由负因数的个数决定当负因数有奇数个时，积为负当负因数有偶数个时，积为‹›三个有理数相乘，可以任意交换因数的位置，或者先把其中的两个因数相乘个数同两个数的和相乘，等于把这个数分别与这两个数相乘，再先确定符号，绝对值再相乘乘法交换律乘法结合律‹›数有偶数个时，积为正多个有理数相乘，可以先确定积的符号，再把各因数的绝对值相乘几个有理数相乘，有个因数是，积就为‹›例解原式‹›三个有理数相个不等于的数相乘，积的符号由负因数的个数决定当负因数有奇数个时，积为负当负因例解原式先确定符号，绝对值再相乘乘法交换律乘法结合律‹›定当负因数有奇数个时，积为负当负因数有偶数个时，积为正多个有理数相乘，可以先确定积的符号，再把各因数的绝对值相乘几个有理数相乘，有个因数是，积就为‹›练习‹›例例题‹›例例题几个不等于的数相乘，积的符号由负因数的个数决定练习‹›例例题‹›例例题几个不等于的数相乘，积的符号由负因数的个数决定当负因数有奇数个时，积为负当负因数有偶数个时，积为正多个有理数相乘，可以先确定积的符号，再把各因数的绝对值相乘几个有理数相乘，有个因数是，积就为‹›例解原式先确定符号，绝对值再相乘乘法交换律乘法结合律‹›‹›三个有理数相个不等于的数相乘，积的符号由负因数的个数决定当负因数有奇数个时，积为负当负因数有偶数个时，积为正多个有理数相乘，可以先确定积的符号，再把各因数的绝对值相乘几个有理数相乘，有个因数是，积就为‹›例解原式先确定符号，绝对值再相乘