有理数的乘法、有理数及其运算.几道计算题不会,

问题描述:

有理数的乘法、有理数及其运算.几道计算题不会,
神仙
0x(-5/6);
(-3)x0.3;
3x(-1/3);
(-1/6)x(-6/7);
(-3/4)x(-8);
(0.25-2/3)x(-36);
30x(1/2-1/3);
8x(-4/5)x1/16;
(1/3+1/4-1/6)x24;
100x(-3)x(-5)x0.01;
(1/4-1/2-1/8)x128;
2.25x(-2.3)x3/25;
(-4)x(-5)x0.25;
(-2.1)x6.5x(-3/7);

0x(-5/6)=0;
(-3)x0.3=-0.9;
3x(-1/3)=-1;
(-1/6)x(-6/7)=1/7;
(-3/4)x(-8)=6;
(0.25-2/3)x(-36)=(1/4-2/3)×(-36)=(3/12-8/12)×(-36)=-5/12×(-36)=15;