①27.055-1.02-8.99②112÷(12-13)③0.38×8.17+3.8×0.383-0.76④[10−(217×38+217×58)]÷767⑤18+[249÷(3.4−1115)×611].
①27.055-1.02-8.99
②÷(-)
③0.38×8.17+3.8×0.383-0.76
④[10−(2×+2×)]÷7
⑤+[2÷(3.4−)×].
答案和解析
①27.055-1.02-8.99,
=26.035-8.99,
=17.045;
②
÷(-),
=÷,
=×6,
=;
③0.38×8.17+3.8×0.383-0.76
=0.38×8.17+0.38×0.383×10-0.76
=0.38×(8.17+3.83)-0.76,
=0.38×12-0.76,
=4.56-0.76,
=3.8;
④[10−(2×+2×)]÷7,
=[10-2×(+)]÷7,
=[10-2]×,
=10×-×,
=-,
=1;
⑤+[2÷(3.4−)×],
=+[÷(−)×],
=+[÷×],
=+[××],
=+,
=.
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