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3.4×7×1.5
=(3+0.4)×1.5×7
=(3×1.5+0.4×1.5)×7
=(4.5+0.6)×7
=5.1×7
=(5+0.1)×7
=5×7+0.1×7
=35+0.7
=35.7
=(3+0.4)×1.5×7
=(3×1.5+0.4×1.5)×7
=(4.5+0.6)×7
=5.1×7
=(5+0.1)×7
=5×7+0.1×7
=35+0.7
=35.7
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