(7.5-七分之四×7)×3分之2要简算,好的加你分,多多的,我等会要去上课,

问题描述:

(7.5-七分之四×7)×3分之2要简算,好的加你分,多多的,我等会要去上课,

(7.5-七分之四×7)×3分之2
=(7.5-3)x2/3
=4.5x2/3
=3

(7.5-4/7×7)×2/3
=(7.5-4)×2/3
=3.5×2/3
=7/2 × 2/3
=7/3

(7.5-七分之四×7)×3分之2
=[7.5-(4/7)×7]×(2/3)
=(7.5-4)×(2/3)
=(15/2-8/2)×(2/3)
=(7/2)×(2/3)
=7/3

3分之7