用简便方法计算. 1.8×0.36+0.18×4.2+22×0.018 0.36×7.4+0.72×1.3.
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(1)1.8×0.36+0.18×4.2+22×0.018,
=1.8×0.36+1.8×0.42+0.22×1.8,
=1.8×(0.36+0.42+0.22),
=1.8×1,
=1.8;
(2)0.36×7.4+0.72×1.3,
=0.36×7.4+0.36×2×1.3,
=0.36×(7.4+2×1.3),
=0.36×(7.4+2.6),
=0.36×10,
=3.6.
=1.8×0.36+1.8×0.42+0.22×1.8,
=1.8×(0.36+0.42+0.22),
=1.8×1,
=1.8;
(2)0.36×7.4+0.72×1.3,
=0.36×7.4+0.36×2×1.3,
=0.36×(7.4+2×1.3),
=0.36×(7.4+2.6),
=0.36×10,
=3.6.
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