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0.7×13/11-6.6×3/7-2.2×3/7+0.7×9/11+3.3×8/7=请详细,
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0.7×13/11-6.6×3/7-2.2×3/7+0.7×9/11+3.3×8/7=请详细,
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答案和解析
0.7×13/11-6.6×3/7-2.2×3/7+0.7×9/11+3.3×8/7
=(0.7×13/11+0.7×9/11)-6.6×3/7-2.2×3/7+(1.1×3)×(8×1/7)
=(0.7×13/11+0.7×9/11)-6.6×3/7-2.2×3/7+8.8×3/7
=0.7×(13/11+9/11)+(8.8-6.6-2.2)×3/7
=0.7×2+0×3/7
=1.4
=(0.7×13/11+0.7×9/11)-6.6×3/7-2.2×3/7+(1.1×3)×(8×1/7)
=(0.7×13/11+0.7×9/11)-6.6×3/7-2.2×3/7+8.8×3/7
=0.7×(13/11+9/11)+(8.8-6.6-2.2)×3/7
=0.7×2+0×3/7
=1.4
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