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(4)(-2又1/2)×(-0.5)³×(-2)²×(-8)
=-2.5×(-1/8)×4×(-8)
=-(2.5×4)×(1/8×8)
=-10×1
=-10
(5)-5²-[-4+(1-0.2×1/5)÷(-2)]
=-25-[-4+(1-1/25)÷(-2)]
=-25-[-4+24/25÷(-2)]
=-25-[-4-12/25]
=-25+4又12/25
=-20又13/25
(6)(-5/8)×(-4)²-0.25×(-5)×(-4)³
=-5/8×16+5/4×(-64)
=-10-80
=-90
=-2.5×(-1/8)×4×(-8)
=-(2.5×4)×(1/8×8)
=-10×1
=-10
(5)-5²-[-4+(1-0.2×1/5)÷(-2)]
=-25-[-4+(1-1/25)÷(-2)]
=-25-[-4+24/25÷(-2)]
=-25-[-4-12/25]
=-25+4又12/25
=-20又13/25
(6)(-5/8)×(-4)²-0.25×(-5)×(-4)³
=-5/8×16+5/4×(-64)
=-10-80
=-90
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