0.25×45.4-0.125×10.8
=0.25×45.5-0.25×0.5×10.8
=0.25×45.5-0.25×5.4
=0.25×(45.5-5.4)
=0.25×40.1
=0.25×(40+0.1)
=0.25×40+0.25×0.1
=0.25×10×4+0.25×0.1
=2.5×4+0.25×0.1
=10+0.025
=10.025
看
(12X21x45x10.2) / (15x4x0.7x5.1) = 3x30x3x2 = 540
给你解释:
12/4=3
21/0.7=30
45/15=3
10.2/5.1=2
如图计算。