-49-4×1×(-18)
脱式计算,能简算的要简算49.4÷1.9-1.88.8×1.253.14×1016.5×3.9-3.9×5.518.09-7.5×(0.14+1.06)...
脱式计算,能简算的要简算
49.4÷1.9-1.8
8.8×1.25
3.14×101
6.5×3.9-3.9×5.5
18.09-7.5×(0.14+1.06) 展开
49.4÷1.9-1.8
8.8×1.25
3.14×101
6.5×3.9-3.9×5.5
18.09-7.5×(0.14+1.06) 展开
1个回答
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(1)49.4÷1.9-1.8
=26-1.8
=24.2
(2)8.8×1.25
=1.1×8×1.25
=1.1×(8×1.25)
=1.1×10
=11
(3)3.14×101
=3.14×(100+1)
=3.14×100+3.14×1
=314+3.14
=317.14
(4)6.5×3.9-3.9×5.5
=3.9×(6.5-5.5)
=3.9×1
=3.9
(5)18.09-7.5×(0.14+1.06)
=18.09-7.5×1.2
=18.09-9
=9.09
=26-1.8
=24.2
(2)8.8×1.25
=1.1×8×1.25
=1.1×(8×1.25)
=1.1×10
=11
(3)3.14×101
=3.14×(100+1)
=3.14×100+3.14×1
=314+3.14
=317.14
(4)6.5×3.9-3.9×5.5
=3.9×(6.5-5.5)
=3.9×1
=3.9
(5)18.09-7.5×(0.14+1.06)
=18.09-7.5×1.2
=18.09-9
=9.09
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