这些题怎么简便运算(能简便就简便)

1个回答

  • 4÷五分之四-五分之四÷4+4×五分之四

    =4×5/4-4/5×1/4+4×4/5

    =5-1/5+16/5

    =5-(1/5-16/5)

    =5-(-3)

    =8

    6.15÷2又2分之1-七分之一×(0.05+4又25分之9)

    =6又3/20×2/5-1/7×(5/100+4又36/100/25)

    =6又3/20×2/5-1/7×(4又41/100)

    =246/100-1/7×441/100

    =246/100-63/100

    =183/100

    八分之七×3.5+2.2×0.875+8.75×100分之43

    =0.875×3.5+2.2×0.875+8.75×0.43

    =8.78×0.35+8.75×0.22+8.75×0.43

    =8.78×(0.35+0.22+0.43)

    =8.75×1

    =8.75