1.2+8.8x1.25 （2.5÷2+2÷2.5）x0.4 （1.4x0.3+2.46）÷1.8简便用算 10
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1.2+8.8×1.25
= 1.2 + (8+ 0.8)×1.25
= 1.2 + 10 +1
= 12.2
(2.5÷2+2÷2.5) × 0.4
= 1 ÷ 2 + 0.8 ÷ 2.5
= 0.5 + 0.32
= 0.82
(1.4×0.3+2.46) ÷ 1.8
= (0.42 + 2.46) ÷ 1.8
= 2.88 ÷ 1.8
= 1.6
= 1.2 + (8+ 0.8)×1.25
= 1.2 + 10 +1
= 12.2
(2.5÷2+2÷2.5) × 0.4
= 1 ÷ 2 + 0.8 ÷ 2.5
= 0.5 + 0.32
= 0.82
(1.4×0.3+2.46) ÷ 1.8
= (0.42 + 2.46) ÷ 1.8
= 2.88 ÷ 1.8
= 1.6
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