怎样简便就怎样算. 32.4×7.9+21×3.24 320÷1.25÷8 3.4×9.9 6.4×(0.125×0.25)
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①32.4×7.9+21×3.24
=3.24×79+21×3.24
=3.24×(79+21)
=3.24×100
=324;
②320÷1.25÷8
=320÷(1.25×8)
=320÷10
=32;
③3.4×9.9
=3.4×(10-0.1)
=3.4×10-0.34
=34-0.34
=33.66;
④6.4×(0.125×0.25)
=0.2×(8×0.125)×(4×0.25)
=0.2×1×1
=0.2.
=3.24×79+21×3.24
=3.24×(79+21)
=3.24×100
=324;
②320÷1.25÷8
=320÷(1.25×8)
=320÷10
=32;
③3.4×9.9
=3.4×(10-0.1)
=3.4×10-0.34
=34-0.34
=33.66;
④6.4×(0.125×0.25)
=0.2×(8×0.125)×(4×0.25)
=0.2×1×1
=0.2.
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