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计算下面各题 32×125 15×(41-17)÷30 57×101-57 42×29+42×71 618-80÷2...
计算下面各题32×12515×(41-17)÷3057×101-5742×29+42×71618-80÷2×5420÷[(205-198)×4]....
计算下面各题 32×125 15×(41-17)÷30 57×101-57 42×29+42×71 618-80÷2×5 420÷[(205-198)×4].
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(1)32×125
=4×8×125
=4×(8×125)
=4×1000
=4000
(2)15×(41-17)÷30
=15×24÷30
=360÷30
=12
(3)57×101-57
=57×(101-1)
=57×100
=5700
(4)42×29+42×71
=42×(29+71)
=42×100
=4200
(5)618-80÷2×5
=618-40×5
=618-200
=418
(6)420÷[(205-198)×4]
=420÷[7×4]
=420÷28
=15
=4×8×125
=4×(8×125)
=4×1000
=4000
(2)15×(41-17)÷30
=15×24÷30
=360÷30
=12
(3)57×101-57
=57×(101-1)
=57×100
=5700
(4)42×29+42×71
=42×(29+71)
=42×100
=4200
(5)618-80÷2×5
=618-40×5
=618-200
=418
(6)420÷[(205-198)×4]
=420÷[7×4]
=420÷28
=15
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