2.8×35+28×5.5+2.8,简便方法?
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2.8×35+28×5.5+2.8
=2.8×35+2.8×55+2.8
=2.8x(35+55) +2.8
=2.8x90 +2.8
=2.8x100 -28 +2.8
=2800 -28 +2.8
=2772 +2.8
=2774.8
=2.8×35+2.8×55+2.8
=2.8x(35+55) +2.8
=2.8x90 +2.8
=2.8x100 -28 +2.8
=2800 -28 +2.8
=2772 +2.8
=2774.8
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简便方法是直接提取公约数2.8得
原式=2.8x(35+55+1)
=2.8x91
=2.8x90+2.8
=252+2.8
=254.8
加油😊!
原式=2.8x(35+55+1)
=2.8x91
=2.8x90+2.8
=252+2.8
=254.8
加油😊!
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解:先找出公约数2.8
原式=2.8(35+55+1)
=2.8x91
=2.8(90+1)
=252+2.8
=254.8
原式=2.8(35+55+1)
=2.8x91
=2.8(90+1)
=252+2.8
=254.8
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