如题所述
19.4+6.1-19.4+6.1=19.4x（6.1-6.1）=19.4x0=0
48.1-8.1x3.93=48.1-（8+0.1）x（4-0.07）=48.1-32-0.4+0.56+0.007=16.1+0.16+0.007=16.26+0.007=16.267
100[（17.6+3.25）x3.5]=100[（20+0.85）x3.5]=100[70+（3+0.5）x0.85]=100（70+2.55+0.425）=100x72.975=7297.5
0.05x1.03x0.2=（0.05x0.2）x1.03=0.01x1.03=0.0103
0.032x1.25=0.004x8x1.25=0.004x10=0.04
0.45x0.99=0.45x（1-0.01）=0.45-0.0045=0.4455
12.5x10.8=12.5x（10+0.8）=125+10=135
4.2x6.51+3.49x4.2=4.2x（6.51+3.49）=4.2x10=42
45x1.58+5.5x15.8=45x1.58+55x1.58=1.58x（45+55）=1.58x100=158
9.99x2.22+3.33x3.34=3.33x3x2.22+3.33x3.34=3.33x（6.66+3.34）=3.33x10=33.3
48.1-8.1x3.93=48.1-（8+0.1）x（4-0.07）=48.1-32-0.4+0.56+0.007=16.1+0.16+0.007=16.26+0.007=16.267
100[（17.6+3.25）x3.5]=100[（20+0.85）x3.5]=100[70+（3+0.5）x0.85]=100（70+2.55+0.425）=100x72.975=7297.5
0.05x1.03x0.2=（0.05x0.2）x1.03=0.01x1.03=0.0103
0.032x1.25=0.004x8x1.25=0.004x10=0.04
0.45x0.99=0.45x（1-0.01）=0.45-0.0045=0.4455
12.5x10.8=12.5x（10+0.8）=125+10=135
4.2x6.51+3.49x4.2=4.2x（6.51+3.49）=4.2x10=42
45x1.58+5.5x15.8=45x1.58+55x1.58=1.58x（45+55）=1.58x100=158
9.99x2.22+3.33x3.34=3.33x3x2.22+3.33x3.34=3.33x（6.66+3.34）=3.33x10=33.3
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第1个回答 2017-03-12
有些是不能简便计算，只能硬算啊，比如空着哪题，只能一步步来，但是有些可以简便计算的，你未简便，我写给你。追答
