简便运算 7.12-3.7+4.88-2.3第二个8.1/0.18第三个10.1*8.6第四个6.3/(0.7*5)
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简便运算 7.12-3.7+4.88-2.3第二个8.1/0.18第三个10.1*8.6第四个6.3/(0.7*5)
简便运算 7.12-3.7+4.88-2.3第二个8.1/0.18第三个10.1*8.6第四个6.3/(0.7*5)
简便运算 7.12-3.7+4.88-2.3第二个8.1/0.18第三个10.1*8.6第四个6.3/(0.7*5)
7.12-3.7+4.88-2.3
=(7.12+4.88)-(3.7+2.3)
=12-6
=6
8.1/0.18
=810/18
=9*90/(9*2)
=90/2
=45
10.1*8.6
=(10+0.1)*8.6
=10*8.6+0.1*8.6
=86+0.86
=86.86
6.3/(0.7*5)
=(9*0.7)/(0.7*5)
=9/5
=1又4/5
6
45
86.86
1.8