40x25%+18x1/4+4÷4
=40x1/4+18x1/4+4x1/4
=(40+18+4)x1/4
=62x1/4
=15.5
(1-1/9)x(0.72÷64%)
=8/9x(18/25÷8/25)
=8/9x18/25x25/8
=2
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40x25%+18x1/4+4÷4,
=40x1/4+18x1/4+4x1/4
=(40+18+4)x1/4
=62x1/4
=15.5
(1-1/9)x(0.72÷64%)
=8/9x(18/25÷16/25)
=8/9x18/25x25/16
=1
如图
40x25%+18x1/4+4÷4=10+9/2+1=15.5
(1-1/9)x(0.72÷64%)=8/9 x 72/64=8/9 x 9/8=1