0.25×7×9 0.25×51简便运算答案要是对的?
3个回答
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0.25x7X9
=0.25X(4+3)X(10-1)
=(0.25x4+0.25x3)x(10-1)
=1.75X10-1.75X1
=17.5-1.75
=15.75
0.25X51
=0.25X(52-1)
=0.25X(4x13-1)
=0.25X4x13-0.25x1
=13-0.25
=12.75
=0.25X(4+3)X(10-1)
=(0.25x4+0.25x3)x(10-1)
=1.75X10-1.75X1
=17.5-1.75
=15.75
0.25X51
=0.25X(52-1)
=0.25X(4x13-1)
=0.25X4x13-0.25x1
=13-0.25
=12.75
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2020-09-14 · 知道合伙人教育行家
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0.25×7×9+0.25×51
=0.25×(7×9+51)
=0.25×(63+51)
=0.25×114
=114÷4
=28.5
=0.25×(7×9+51)
=0.25×(63+51)
=0.25×114
=114÷4
=28.5
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