1.4×66.6+2.9×99.9有简便运算吗?
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▲1.4×66.6+2.9×99.9
【提取33.3】
=33.3x(1.4x2+2.9x3)
=33.3x(2.8+8.7)
=33.3x11.5
=33.3x(11+0.5)
=366.3+16.65
=382.95
或
▲ 1.4×66.6+2.9×99.9
=0.2x7x66.6+(3-0.1)(100-0.1)
=0.2x466.2+(300-10-0.3+0.01)
=93.24+(300-10.29)
=93.24+289.71
=382.95
【提取33.3】
=33.3x(1.4x2+2.9x3)
=33.3x(2.8+8.7)
=33.3x11.5
=33.3x(11+0.5)
=366.3+16.65
=382.95
或
▲ 1.4×66.6+2.9×99.9
=0.2x7x66.6+(3-0.1)(100-0.1)
=0.2x466.2+(300-10-0.3+0.01)
=93.24+(300-10.29)
=93.24+289.71
=382.95
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1.4×66.6+2.9×99.9
=33.3×(2.8+8.7)
=33.3×11.5
=30×11.5+3×11.5+0.3×11.5
=345+34.5+3.45
=379.5+3.45
=382.95
=33.3×(2.8+8.7)
=33.3×11.5
=30×11.5+3×11.5+0.3×11.5
=345+34.5+3.45
=379.5+3.45
=382.95
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1.4×66.6+2.9×99.9
=1.4×(2×33.3)+2.9×(3×33.3)
=1.4×2×33.3+2.9×3×33.3
=2.8×33.3+8.7×33.3
=(2.8+8.7)×33.3
=11.5×33.3
=(10+1+0.5)×33.3
=10×33.3+1×33.3+0.5×33.3
=333+33.3+166.5
=382.95
=1.4×(2×33.3)+2.9×(3×33.3)
=1.4×2×33.3+2.9×3×33.3
=2.8×33.3+8.7×33.3
=(2.8+8.7)×33.3
=11.5×33.3
=(10+1+0.5)×33.3
=10×33.3+1×33.3+0.5×33.3
=333+33.3+166.5
=382.95
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1.4×66.6+2.9×99.9=33.3×1.4×2+33.3×2.9×3=33.3×(2.8+8.7)=33.3×11.5=382.95
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