2个回答
展开全部
原式
=[49+9(31x56)]÷7
=(49+9x31x56)÷7
=49÷7+9x31x56÷7
=7+9x31x8
=7+279x8
=7+2232
=2239
=[49+9(31x56)]÷7
=(49+9x31x56)÷7
=49÷7+9x31x56÷7
=7+9x31x8
=7+279x8
=7+2232
=2239
展开全部
原式
=[49+9(31x56)]÷7
=(49+9x31x56)÷7
=49÷7+9x31x56÷7
=7+9x31x8
=7+279x8
=7+2232
=2239
=[49+9(31x56)]÷7
=(49+9x31x56)÷7
=49÷7+9x31x56÷7
=7+9x31x8
=7+279x8
=7+2232
=2239
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