(1)4.21*(-4/9)+4/7*(-2.79)+8*1/100
1个回答

初一的数学题计算题啊!请大侠们速速解答!

(1)4.21*(-4/7)+4/7*(-2.79)+8*1/100

=-4/7*(4.21+2.79)+0.08

=-4/7*7+0.08

=-4+0.08

=-3.92

(2)(-1又3/4)-(+6又1/3)-2.25+10/3-5

=(-1又3/4-2.25)+(-6又1/3+10/3)-5

=-4-3-5

=-12

(3)(-1又3/4)+(-6又1/3)+(-2.25)+10/3

=(-1又3/4-2.25)+(-6又1/3+10/3)

=-4-3

=-7