简便运算(急)
1.2.5÷2+250×50%+0.5×47.52.5/8×75%+1.375×0.75-3/4...
1. 2.5÷2+250×50%+0.5×47.5
2. 5/8×75%+1.375×0.75-3/4 展开
2. 5/8×75%+1.375×0.75-3/4 展开
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1. 2.5÷2+250×50%+0.5×47.5
= 2.5×0.5+250×0.5+0.5×47.5
=0.5×(2.5+250+47.5)
=0.5×300
=150
2. 5/8×75%+1.375×0.75-3/4
=0.625×0.75+1.375×0.75-0.75
=0.75×(0.625+1.375-1)
=0.75×1
=0.75
= 2.5×0.5+250×0.5+0.5×47.5
=0.5×(2.5+250+47.5)
=0.5×300
=150
2. 5/8×75%+1.375×0.75-3/4
=0.625×0.75+1.375×0.75-0.75
=0.75×(0.625+1.375-1)
=0.75×1
=0.75
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2.5÷2+250×50%+0.5×47.5
=1.25+250×0.5+0.5×47.5
=0.5×(2.5+250+47.5)
=0.5×300
=150
5/8×75%+1.375×0.75-3/4
=5/8×3/4+1.375×3/4-3/4
=3/4×(5/8+1.375-1)
=3/4×(0.625+1.375-1)
=3/4×(0.625+0.375)
=3/4×1
=3/4
=1.25+250×0.5+0.5×47.5
=0.5×(2.5+250+47.5)
=0.5×300
=150
5/8×75%+1.375×0.75-3/4
=5/8×3/4+1.375×3/4-3/4
=3/4×(5/8+1.375-1)
=3/4×(0.625+1.375-1)
=3/4×(0.625+0.375)
=3/4×1
=3/4
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原式 =5x13+35x13 =(5+35)x13 =40x13 =520
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