7.56×2.5+0.44×2.5
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①6.8×0.56+0.44×6.8
=6.8×(0.56+0.44)
=6.8×1
=6.8
②44×2.5×0.9
=11×4×2.5×0.9
=(4×2.5)×11×0.9
=10×9.9
=99
③7.2÷0.5÷0.2
=7.2÷(0.5×0.2)
=7.2÷0.1
=72
=6.8×(0.56+0.44)
=6.8×1
=6.8
②44×2.5×0.9
=11×4×2.5×0.9
=(4×2.5)×11×0.9
=10×9.9
=99
③7.2÷0.5÷0.2
=7.2÷(0.5×0.2)
=7.2÷0.1
=72
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