9.8×1.2+0.2×8.8的+简便运算?
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(1)9.8x1.2+0.2x8.8
=(10-0.2)x1.2+0.2x8.8
=12-0.2x1.2+0.2x8.8
=12+0.2(8.8-1.2)
=12+0.2x7.6
=12+1.52
=13.52
(2)9.8x1.2+0.2x8.8
=(10-0.2)x1.2+0.2x8.8
=12-0.24+1.76
=12+1.52
=13.52
=(10-0.2)x1.2+0.2x8.8
=12-0.2x1.2+0.2x8.8
=12+0.2(8.8-1.2)
=12+0.2x7.6
=12+1.52
=13.52
(2)9.8x1.2+0.2x8.8
=(10-0.2)x1.2+0.2x8.8
=12-0.24+1.76
=12+1.52
=13.52
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