7.2×25%+2.8×25% 等于多少、?

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7.2×25%+2.8×25% 等于多少、?
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7.2×25%+2.8×25% 等于多少、?
7.2×25%+2.8×25% 等于多少、?

7.2×25%+2.8×25% 等于多少、?
7.2×25%+2.8×25%
=
(7.2+2.8)×25%
=10×25%
=2.5

7.2×25%+2.8×25%=2.5

7.2×25%+2.8×25%
=0.25×(7.2+2.8)
=0.25×10
=2.5

7.2×25%+2.8×25%
=(7.2+2.8)×25%
=10×0.25
=2.5

7.2×25%+2.8×25%=2.5
(7.8+2.5)×25%=2.5

7.2×25%+2.8×25%
=(7.2+2.8)×25%
=10×25%
=2.5