8.54-(7.4-3.68)+3.9能简便运算吗
能简便计算要简便计算(+7.4)-(+3.6)(-25.9)÷(-7)[0.15+(3.74-1.8)÷0.4]×20(1-0.8)×(4-3.68)÷0.0176.14...
能简便计算要简便计算 (+7.4)-(+3.6) (-25.9)÷(-7) [0.15+(3.74-1.8)÷0.4]×20 (1-0.8)×(4-3.68)÷0.01 76.14-12.28-16.72 7.5-7.5×0.99 6.3×18.5+18.5×3.7 6.78÷0.8÷0.125 8.9÷1.25
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①(+7.4)-(+3.6)
=7.4-3.6
=3.8
②(-25.9)÷(-7)
=25.9÷7
=3.7
③[0.15+(3.74-1.8)÷0.4]×20
=[0.15+1.94÷0.4]×20
=[0.15+4.85]×20
=5×20
=100
④(1-0.8)×(4-3.68)÷0.01
=0.2×0.32×100
=6.4
⑤76.14-12.28-16.72
=76.14-(12.28+16.72)
=76.14-29
=47.14
⑥7.5-7.5×0.99
=7.5×(1-0.99)
=7.5×0.01
=0.075
⑦6.3×18.5+18.5×3.7
=18.5×(6.3+3.7)
=18.5×10
=185
⑧6.78÷0.8÷0.125
=6.78÷(0.8×0.125)
=6.78÷0.1
=67.8
⑨8.9÷1.25
=8.9×8÷(1.25×8)
=71.2÷10
=7.12
=7.4-3.6
=3.8
②(-25.9)÷(-7)
=25.9÷7
=3.7
③[0.15+(3.74-1.8)÷0.4]×20
=[0.15+1.94÷0.4]×20
=[0.15+4.85]×20
=5×20
=100
④(1-0.8)×(4-3.68)÷0.01
=0.2×0.32×100
=6.4
⑤76.14-12.28-16.72
=76.14-(12.28+16.72)
=76.14-29
=47.14
⑥7.5-7.5×0.99
=7.5×(1-0.99)
=7.5×0.01
=0.075
⑦6.3×18.5+18.5×3.7
=18.5×(6.3+3.7)
=18.5×10
=185
⑧6.78÷0.8÷0.125
=6.78÷(0.8×0.125)
=6.78÷0.1
=67.8
⑨8.9÷1.25
=8.9×8÷(1.25×8)
=71.2÷10
=7.12
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