3.计算下各题,怎算算(12分+17.15+1.25-0.8
1个回答
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(1)2.6×11.8-0.9×2×2.6
=2.6×11.8-1.8×2.6
=2.6×(11.8-1.8)
=2.6×10
=26
(2)0.8+(3.2-2.99÷2.3)
=0.8+(3.2-1.3)
=0.8+1.9
=2.7
(3)6.3×4.8+3.7×4.8
=(6.3+3.7)×4.8
=10×4.8
=48
(4)13.8-3.8÷0.25×4
=13.8-15.2×4
=13.8-60.8
=-47
=2.6×11.8-1.8×2.6
=2.6×(11.8-1.8)
=2.6×10
=26
(2)0.8+(3.2-2.99÷2.3)
=0.8+(3.2-1.3)
=0.8+1.9
=2.7
(3)6.3×4.8+3.7×4.8
=(6.3+3.7)×4.8
=10×4.8
=48
(4)13.8-3.8÷0.25×4
=13.8-15.2×4
=13.8-60.8
=-47
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