脱式计算(能简算的要简算.)7.8+4.56+2.2 0.75×6.4-0.75×5.4 &n...
脱式计算(能简算的要简算.)7.8+4.56+2.20.75×6.4-0.75×5.478÷0.25÷0.49.9×57....
脱式计算(能简算的要简算.)7.8+4.56+2.2 0.75×6.4-0.75×5.4 78÷0.25÷0.4 9.9×57.
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(1)7.8+4.56+2.2,
=(7.8+2.2)+4.56,
=10+4.56,
=14.56;
(2)0.75×6.4-0.75×5.4,
=0.75×(6.4-5.4),
=0.75×1,
=0.75;
(3)78÷0.25÷0.4,
=78÷(0.25×0.4),
=78÷0.1,
=780;
(4)9.9×57,
=(10-0.1)×57,
=10×57-0.1×57,
=570-5.7,
=564.3.
=(7.8+2.2)+4.56,
=10+4.56,
=14.56;
(2)0.75×6.4-0.75×5.4,
=0.75×(6.4-5.4),
=0.75×1,
=0.75;
(3)78÷0.25÷0.4,
=78÷(0.25×0.4),
=78÷0.1,
=780;
(4)9.9×57,
=(10-0.1)×57,
=10×57-0.1×57,
=570-5.7,
=564.3.
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