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简介:
★脱式计算。(能简算的要简算)
3.06×0.9+9.1×3.06
=3.06×(0.9+9.1)
=3.06×10
=30.6
30×[7.5÷(2.7-1.2)]
=30×(7.5÷1.5)
=30×5
=150
(2.8+3.2×4)÷1.5
=(2.8+12.8)÷1.5
=15.6÷1.5
=10.4
5.6×(12.5﹣8.5÷0.85)
=5.6×(12.5﹣10)
=5.6×2.5
=1.4×(4×2.5)
=1.4×10
=14
98.5-125÷25×13
=98.5-5×13
=98.5-65
=33.5
1.4+12.6÷0.28×0.2
=1.4+45×0.2
=1.2+9
=10.2