运用简便方法计算72×125 9...
运用简便方法计算72×12599×38+383200÷4÷259.14-1.43-4.571.88+2.3+3.798×47....
运用简便方法计算72×125 99×38+38 3200÷4÷25 9.14-1.43-4.57 1.88+2.3+3.7 98×47.
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(1)72×125,
=9×8×125,
=9×(8×125),
=9×1000,
=9000;
(2)99×38+38,
=(99+1)×38,
=100×38,
=3800;
(3)3200÷4÷25,
=3200÷(4×25),
=3200÷100,
=32;
(4)9.14-1.43-4.57,
=9.14-(1.43+4.57),
=9.14-6,
=3.14;
(5)1.88+2.3+3.7,
=1.88+(2.3+3.7),
=1.88+6,
=7.88;
(6)98×47,
=(100-2)×47,
=100×47-2×47,
=4700-94,
=4606.
=9×8×125,
=9×(8×125),
=9×1000,
=9000;
(2)99×38+38,
=(99+1)×38,
=100×38,
=3800;
(3)3200÷4÷25,
=3200÷(4×25),
=3200÷100,
=32;
(4)9.14-1.43-4.57,
=9.14-(1.43+4.57),
=9.14-6,
=3.14;
(5)1.88+2.3+3.7,
=1.88+(2.3+3.7),
=1.88+6,
=7.88;
(6)98×47,
=(100-2)×47,
=100×47-2×47,
=4700-94,
=4606.
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