102×4.5 7.8×6.9+2.2×6.9 5.6×0.25 8×(20-1.25)
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(1)102×4.5,
=(100+2)×4.5,
=100×4.5+2×4.5,
=450+9,
=459;
(2)7.8×6.9+2.2×6.9,
=(7.8+2.2)×6.9,
=10×6.9,
=69;
(3)5.6×0.25,
=1.4×4×0.25,
=1.4×(4×0.25),
=1.4×1,
=1.4;
(4)8×(20-1.25),
=8×20-8×1.25,
=160-10,
=150.
=(100+2)×4.5,
=100×4.5+2×4.5,
=450+9,
=459;
(2)7.8×6.9+2.2×6.9,
=(7.8+2.2)×6.9,
=10×6.9,
=69;
(3)5.6×0.25,
=1.4×4×0.25,
=1.4×(4×0.25),
=1.4×1,
=1.4;
(4)8×(20-1.25),
=8×20-8×1.25,
=160-10,
=150.
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